Homework Help: Math: Statistics

Recent Homework Questions About Statistics

Statistics
3. The average weekly allowance of students last year at a private high school was Php 800.00 per week, based on an enrollment of 2000 students. The junior high school students who did not have this information interviewed 50 students and found their average weekly allowance ...
Tuesday, January 15, 2013 at 11:05am

Statistics (Please help me)
For the following studies, identify the possible target population, elementary unit, sampling frame, sampled population and sampling unit. 1. A doctor wishes to study people working at a hotel in Makati afflicted with hypertension. 2. A researcher would like to estimate the ...
Tuesday, January 15, 2013 at 10:50am

statistics
• Linear Regression In the babies.dta full dataset, generate a covariate called painind defined as 1 if the infant experienced severe pain upon receiving the shot (pain0 = 7) and as 0 otherwise. In Stata, you can use the commands: generate painind = 0 replace painind = 1 ...
Tuesday, January 15, 2013 at 1:53am

statistics
• Two-sample Non-parametric Test Now, we examine the relationship between cry time and group among infants at Northbay. 1. Suppose we wish to perform a two-sample test, but we do not want to make any normality (or other strong parametric) assumptions. Conduct an ...
Tuesday, January 15, 2013 at 1:49am

statistics
1. Prospective Cohort Study The following tables show the crude and sex-specific results from a Prospective Cohort Study that examines the association between a binary exposure (E) and the development of a disease (D) during 20 years of follow-up. Full Data: Sex-Specific Data...
Tuesday, January 15, 2013 at 1:48am

statistics
Select the most appropriate study design for each of the following questions. (Note: All study design options may not be used and each design option can be used more than once. 1. A study is done to examine the association between a mother’s education and risk of a ...
Tuesday, January 15, 2013 at 1:46am

Statistics - Please help
Here are the monsoon rains (in millimeters) for the 23 strong El Nino years between 1871 and 2004: 628 669 740 651 710 717 698 653 604 781 784 790 811 830 858 896 806 790 792 957 872 a. To make the stemplot of these rainfall amounts, round the data to the nearest 10, so that ...
Monday, January 14, 2013 at 10:31pm

Statistics
The intermediate answers from some calculations based on whole number scores are X=4.3467892 and Y=3.3333. We now want to find X(2)+Y(2). After rounding, what values of X and Y do we use?
Monday, January 14, 2013 at 8:22pm

statistics
Prospective Cohort Study The following tables show the crude and sex-specific results from a Prospective Cohort Study that examines the association between a binary exposure (E) and the development of a disease (D) during 20 years of follow-up. Full Data: Sex-Specific Data: ...
Monday, January 14, 2013 at 6:28pm

statistics
Linear Regression In the babies.dta full dataset, generate a covariate called painind defined as 1 if the infant experienced severe pain upon receiving the shot (pain0 = 7) and as 0 otherwise. In Stata, you can use the commands: generate painind = 0 replace painind = 1 if ...
Monday, January 14, 2013 at 6:26pm

statistics
Two-sample Non-parametric Test Now, we examine the relationship between cry time and group among infants at Northbay. 1. Suppose we wish to perform a two-sample test, but we do not want to make any normality (or other strong parametric) assumptions. Conduct an appropriate non...
Monday, January 14, 2013 at 6:25pm

statistics
. Using the central limit theorem, construct a 95% confidence interval for the average total cry time for infants in the control group and infants in the intervention group. For this question only, assume that the standard deviation of cry time within each group is known and ...
Monday, January 14, 2013 at 6:24pm

statistics/probability
The supply office for a large construction firm has three welding units of Brand A and three welding units that are not Brand A in stock. If a welding unit is requested, the probability is .7 that the request will be for Brand A. Find the probability that exactly one of the ...
Monday, January 14, 2013 at 5:14pm

statistics
El Nino and the mosoon. The earth is interconnected. For example, it appears that El Nino, the periodic warming of the Pacific Ocean west of South America, affects that the monsoon rains that are essential for agriculture in India. Here are the monsoon rains (in millimeters) ...
Monday, January 14, 2013 at 1:09am

Statistics
Classify the following as an example of nominal, ordinal, interval, or ratio level of measurement, and state why it representa this level: heights of 40 high school students.
Saturday, January 12, 2013 at 11:57pm

Statistics
Which of the following statements are true about matched pairs analysis? I. In a matched pair analysis you use a single-sample procedure. The sample is made up of the difference between pairs of observations. II. In a matched pairs analysis the two original samples are said to...
Saturday, January 12, 2013 at 5:53pm

Statistics
Which of the following statements is not true about samples that can be treated as matched pairs data? I. Data collected on these samples is analyzed by calculating the differences between paired observations and using that data in one sample tests. II. Each value in the first...
Saturday, January 12, 2013 at 5:52pm

Data
Research South Carolina for data that is commonly used in health services systems. This includes census data, vital statistics data (birth, deaths, marriages, and divorces), surveillance data, administrative data, and survey research data. Keep in mind that most of this data ...
Friday, January 11, 2013 at 4:24pm

Statistics & Probability
A researcher conducted a study of the access speed of 45 hard drives and concluded that his maximum error of estimate was 28. If he were to conduct a second study to reduce the maximum error of estimate to 7, about how many hard drives should he include in his new sample? ...
Friday, January 11, 2013 at 3:59pm

Math, Statistics
According to a recent survey, 38% of americans get 8 hours or less of sleep. if 25 people are selected, find the probability that 14 or more people will get 8 hours or less of sleep.
Friday, January 11, 2013 at 2:34pm

statistics
The company policy for customer service representatives gives time off for positive reviews. If, in the first 20 calls a customer service agent handles in a day, 13 or more elect to take a subsequent survey and rate the service as “excellent”, then the company gives ...
Thursday, January 10, 2013 at 9:30am

mathematical statistics
Suppose X_n is a sequence of independent Bernoulli random variables and p(X_n=1)=p_n. If Y=∑_(n=1)^∞▒X_n is convergent with probability 1 ,is E(Y) convergent?
Thursday, January 10, 2013 at 6:17am

mathematical statistics
Suppose a_n∈ [0,1] and X_n is a sequence of i.i.d random variables with p.d.f : p(X_n=1)= p(X_n= -1)=0.5 . ∑_(n=1)^∞▒a_n X_n is convergent with probability 1, is ∑_(n=1)^∞▒a_n^2 convergent?
Thursday, January 10, 2013 at 5:29am

statistics
100 raffle tickets are sold for $3 with one grand prize of $200. Julie purchased one ticket. What is her expectation?
Tuesday, January 8, 2013 at 1:41pm

Statistics
Can you explain confidence intervals as it relates to the results of this obesity study? Results. Of 3069 sampled students, 2681 (87%) were measured. The prevalence of overweight was 43% (95% confidence interval [CI] = 39%, 47%), more than half of whom were obese. Overall ...
Monday, January 7, 2013 at 7:57pm

statistics
A license plate is to have 3 digits followed by 2 uppercase letters. What is the number of different license plates possible if repetition of numbers and letters is not permitted?
Monday, January 7, 2013 at 3:30pm

statistics-?mean average with lowest number out?
A mean average of 60 on 7 exams is needed to pass a course. on his first 6 exams, Adam received grades of 46,74,70,59,66 and 72. if his lowest grade of the exams already taken is to be dropped,what grade must he receive on his last exam to pass?
Monday, January 7, 2013 at 3:26pm

statistics
Randomly selected red suits and ora king
Sunday, January 6, 2013 at 4:14pm

statistics
your teacher has invented a fair dice game to play. your teacher will roll one fair eight sided die and you will roll a fair six sided die. each player rolls once and the winner is the person with the higher number. in case of a tie neither player wins. a. let A be the event &...
Sunday, January 6, 2013 at 3:03pm

Statistics & Probability
If X is a normal random variable with mean 11, and if the probability that X is less than 12.10 is .72 , then what is the standard deviation of X? Select one: a. 3.00 b. 6.25 c. 2.50 d. 1.25 Please note that the answer for the above is stated as c.2.50. However, my answer ...
Friday, January 4, 2013 at 6:57pm

Probability and Statistics
For question 1, here's the numbers you use: {20, 18, 17, 19, 22, 29, 16, 27, 24}. 1. Calculate the 50th percentile. For questions 2 and 3 use this number line: {16, 17, 18, 19, 20, 22, 24, 27, 29, 80} 2. Calculate the z-score for the 80 & explain what it means. (Explain ...
Friday, January 4, 2013 at 6:13pm

statistics
At a large dept. store, the avg. number of years of employment for a cashier is 5.7 with a standard deviation of 1.8 years. If the number of years of employment at this department store is normally distributed, what is the probability that a cashier selected at random has ...
Friday, January 4, 2013 at 12:48pm

statistics
A food snack manu. samples 15 bags of pretzels off the assembly line and weighed their contents. If the sample mean is 10.0 and the sample standard deviation is .15, find the 95% confidence interval estimate for the true mean.
Thursday, January 3, 2013 at 8:43pm

statistics
A sample of 25 different payroll depts. found that the employees worked an average of 310.3 days a year with a standard deviation of 23.8 days. What is the 90% confidence interval for the average days worked by employees in all payroll departments?
Thursday, January 3, 2013 at 8:42pm

ENGLISH HELP!!!
A feature article about a plane crash would be more likely than a hard news article to include ? A)the date, time, and location of the crash. B)a profile of one of the survivors of the crash. C)statistics about other crashes involving the same airline. D)comments from top ...
Tuesday, January 1, 2013 at 9:58am

Advanced Statistics
What is Conceptual Framework...?
Tuesday, January 1, 2013 at 7:04am

Statistics
MBA_GPA BS GPA 2.82 3.05 3.49 3.45 3.28 3.5 3.25 3.55 3.26 3.3 2.87 3.05 3.16 3.35 3.4 3.35 2.84 3.05 3.72 3.7 3.22 3.5 3.44 3.55 3.65 3.9 3.02 3.3 3.03 3.25 3.8 3.8 3.23 3.5 3.26 3.5 3.53 3.75 3.75 3.9 3.15 3.2 3.66 3.75 3.36 3.45 3.79 3.85 2.85 3.05 3.74 3.9 3.23 3.25 3.52 3...
Saturday, December 29, 2012 at 6:55pm

statistics
Can a student keep up their grade performance at the next level? Is a strong GPA at the Bachelors level a good predictor of a strong GPA at the Masters level, or are GPAs naturally going to decline since graduate school is tougher, or will GPAs automatically be higher in ...
Saturday, December 29, 2012 at 6:08pm

STATISTICS
Length of Hospital Stays: The average length of “short” hospital stays for men is slightly longer thatn that for women: 5.2 days vs. 4.5 days. A random sample of recent hospital stays for both men and women revealed the following. At ? = 0.01, is there sufficient ...
Friday, December 28, 2012 at 2:31pm

Statistics
A shoe store knows that the purchase amount by its customers is a random variable that follows a normal distribution with a mean of $30 and a standard deviation of $9. What is the probability that a randomly selected customer will spend $30 or more at this store?
Thursday, December 27, 2012 at 7:28pm

statistics
Suppose that 50 identical batteries are being tested. After 8 hours of continuous use, assume that a given battery is still operating with a probability of .70 and has failed with a probability of .30. What is the probability that between 25 and 30 batteries (inclusive) will ...
Wednesday, December 26, 2012 at 9:14pm

Statistics
A lock on a bank vault consists of 3 dials, each with 30 positions. In order for the vault to open, each of the three dials must be in the correct position. How many different dial combinations are there for this lock?
Wednesday, December 26, 2012 at 8:26pm

Statistics
Please can some one help me with the following: A fisherman finds that approximately 17% of all his fish go bad by the time he takes them to the market. The fisherman catches 1,000 fish. A. How many will go bad by the time he takes them to the market? B. Find the standard ...
Wednesday, December 26, 2012 at 12:21am

statistics
a. Compute the mean, median, and mode. b. Compute the variance, standard deviation, range, coefficient of variation, and Z scores. Are there any outliers? Explain. c. Are the data skewed? If so, how? d. Based on the results of (a) through (c), what conclusions can you reach ...
Sunday, December 23, 2012 at 10:57pm

statistics
a research wanted to test a new diabetes drug: what level of significance would she use in testing?
Sunday, December 23, 2012 at 2:21pm

statistics
considering that a research can test at the <p=.05(95%), p=.001 (99.9%) level for statistical significance, how would you use these 3 levels in relationship to risk to patients in implementing the decision of your research?
Saturday, December 22, 2012 at 12:43pm

Statistics Help!
1. What does a stepwise regression analysis do? 2. What tests are used for longitudinal studies with 1 or more dependent variables?
Thursday, December 20, 2012 at 1:55pm

Statistics
The game of chuck-a-luck consists of rolling 3 dice. The player picks a number, 1, 2, 3, 4, 5, or 6. Winning and losing depends on the number of times the number appears on the top of each die. If the number appears once then the winnings are equal to the bet. If the number ...
Tuesday, December 18, 2012 at 11:48pm

Statistics
statistics homework help A drinking game involves a 14 sided die. Six of the 14 faces are squares A, B, C, D, E,and F for short. The other eight are triangles which are called 1,2,3,4,5,6,7, and 8. Each of the squares is equally likely. but he triangle probability differs from...
Tuesday, December 18, 2012 at 9:18pm

Statistics
If you roll a fair die 100 times and 35 of the rolls result in a six, what would be the probability of the outcome of a 2, P(2)? P(2) = 0.02 P(2) = 2 P(2) = 35 P(2) = 0.35
Tuesday, December 18, 2012 at 10:57am

Statistics
Suppose the correlation between two variables is -0.57. If each of the y-values is multiplied by -1, which of the following is true about the new scatterplot? It slopes up to the right, and the correlation is -0.57 It slopes up to the right, and the correlation is +0.57 It ...
Tuesday, December 18, 2012 at 10:56am

Statistics
An economist found that a random sample of 42 high school teachers had an average annual salary of $56,490. A previous study showed that the population standard deviation is $4150. Find the 99% confidence interval for µ, the average annual salary of all high school ...
Monday, December 17, 2012 at 11:16pm

Statistics
7. Most powerful business women in America. Consider that the data set is a normal distribution with a mean of 50 years and a standard deviation of 5 years. A powerful woman is randomly selected from the data, and her age is observed. Please calculate the probability of the ...
Monday, December 17, 2012 at 9:18pm

URGENT LANGUAGE ARTS
1. The author's tone in this editorial is (1 point) sad. humorous. compassionate. angry. 2. The author contrasts NHL rules and Canadian law to make the point that (1 point) Canadian law has harsher penalties for violence than the NHL. NHL rules are strictly reinforced. ...
Monday, December 17, 2012 at 9:00pm

Statistics
If you roll a fair die 100 times and 35 of the rolls result in a six, what would be the probability of the outcome of a 2, P(2)? P(2) = 0.02 P(2) = 2 P(2) = 35 P(2) = 0.35
Monday, December 17, 2012 at 11:16am

Statistics
A computer repair service found that a random sample of 45 repair costs had a mean cost of $659. Assume that the population standard deviation is $125. Calculate the margin of error, E, for a 95% confidence interval for the population mean µ.
Monday, December 17, 2012 at 2:33am

statistics
Then, for the following two examples, determine the null and alternative as well as state which one represents the claim. State what type of test will be completed: left-tailed, right-tailed, or two-tailed. The average score of the first exam for the class is an 81%.Claim 2: ...
Sunday, December 16, 2012 at 7:12pm

statistics
In a simple random sample of 50 plain M&M candies, it is found that none of them are blue. We want to use a 0.01 significance level to test the claim of Mars, Inc., that the proportion of M&M candies that are blue is equal to 0.10.
Sunday, December 16, 2012 at 11:06am

statistics
) The personnel manager of a consumer products company asked a random sample of 300 employees how they felt about how they felt about going to a flex schedule, which would allow employees to choose their arrival and leaving times, on a five day schedule. This would replace the...
Sunday, December 16, 2012 at 2:14am

statistics
The tires are also tested for failure during a road test where they are subjected to road hazards. A test of 600 tires resulted in the failure of 30 tires. a) Find a 95% confidence interval on the proportion of failures for the new formula of of rubber. b) The proportion of ...
Sunday, December 16, 2012 at 2:12am

statistics
The accompanying multiple regression outputs estimate the following model: annual cost = 0 + 1(Type of School) + 2(Average Total SAT) where: annual cost = annual cost at a college in thousands of dollars Average Total SAT = average scholastic aptitude ...
Sunday, December 16, 2012 at 2:09am

statistics please
a basketball scout randomly selected 144 players and timed howlong eah player took to perform a certain drill. the times in thissample were distributed with a mean of 8 minutes. the populationstandard deviation was known to be 3 minutes. (a) find the critical value for a 95% ...
Saturday, December 15, 2012 at 4:01pm

statistics
a large study involving over 20000 individuals shows that the mean percentage intake of kilocalories from fat was 39% with a range from 6%- 72%. a small sample study was conductd to determine if the mean intake of patiens was different from 39%. a sample of 15 patients had a ...
Saturday, December 15, 2012 at 1:14pm

statistics
experience in investigating insurance claims show that the averagecost to process a claim is approximately normally distributed witha mean of $80.new cost-cutting measures were started and a sampleof 25 claims was tested .the sample mean of the costs to processthese claims was...
Saturday, December 15, 2012 at 12:53pm

Statistics
please help having difficulty with this problem. It was noted that 40% of the people in Dallas read the morning newspaper. A random sample of 18 people is selected from the city. On average, how many people would you expect to read the morning newspaper in a sample of 18?
Thursday, December 13, 2012 at 8:33pm

Statistics
I'm having a problem with this problem. Please help. Thank you.. Find the probability that more than 13 people will read the morning newspaper..
Thursday, December 13, 2012 at 6:54pm

statistics
What is the advantage of using a two-factor design rather than conducting two separate studies, each investigating one of the factors?
Thursday, December 13, 2012 at 5:42pm

statistics
Describe a hypothesis related to the area of psychology in which you are predicting an interaction. Describe the specific nature of the interaction and why you think an interaction would occur.
Thursday, December 13, 2012 at 5:31pm

Statistics
assume that adults have IQ scores that are normally distributed with a mean of 105 and a standard deviation of 15 find the probability that a randomly selected adult has an IQ between 89 and 121 ?
Wednesday, December 12, 2012 at 8:29pm

statistics please
Experience in investigating insurance claims shows that the average cost to process a claim is approximately normally distributed with a mean of $80. New cost-cutting measures were started and a sample of 25 claims was tested. The sample mean of the costs to process these ...
Wednesday, December 12, 2012 at 6:59pm

statistics
The mean annual income of employees who took a statistics course is greater than $60,000.
Wednesday, December 12, 2012 at 1:13pm

statistics
2. A test measuring basic math skills in adults is normally distributed, with mean = 20 and standard deviation = 7. Calculate the z score and T score for each of the following test scores: - X = 11
Wednesday, December 12, 2012 at 1:08pm

statistics
5. A professor teaching introductory psychology gave the grades that follow. According to the normal curve, she should have given about 4% A’s, 14% B’s, 64% C’s, 14% D’s, and 4% F’s. Do a Chi-Square to determine if the actual grade assignment ...
Wednesday, December 12, 2012 at 3:25am

College Statistics
What would be the range of impact of an individualized travel marketing program that covers 200,000 workers in Denver by 2022? The program would inform workers about mass transit options. Assume each worker drives 17.5 miles one way, 5 days a week with an average fuel economy ...
Tuesday, December 11, 2012 at 11:55pm

statistics
6. Facebook reports that the average number of Facebook friends worldwide is 175.5 with a standard deviation of 90.57. If you were to take a sample of 25 students, what is the probability that the mean number Facebook friends in the sample will be 190 friends or more?
Tuesday, December 11, 2012 at 9:45pm

statistics
 Variable N Mean StDev SE Mean 95% CI  Sleep 20 6.950 1.572 0.352 (6.214, 7.686)  Give me the interpre the 95% confidence interval fir the hours of sleep a student gets.
Tuesday, December 11, 2012 at 9:43pm

statistics
23 percent of all homes purchased were investments 800 homes were sold what is probability 175 of homes were for investment
Tuesday, December 11, 2012 at 9:22pm

Statistics
Suppose that the population of weights of airline passengers has mean 150 lbs. and standard deviation 25 lbs. A certain plane has a capacity of 7,800 lbs. (a) What is the probability that a flight of 50 passengers will exceed capacity it? (b) If we wish to reduce the chance of...
Tuesday, December 11, 2012 at 7:33pm

Statistics
Fire department response time is the length of time it takes a fire truck to arrive at the scene of a fire starting from the time the call was given to the truck. Response time for Gabble Fire Department follows a mound shaped and symmetric distribution. The response time has ...
Tuesday, December 11, 2012 at 4:21pm

statistics
A tobacco company claims that the nicotine content of its "light" cigarettes has a mean of milligrams and a standard deviation of milligrams. What is the probability that randomly selected light cigarettes from this company will have a total combined nicotine content...
Tuesday, December 11, 2012 at 9:19am

english
college graduation rates in USA and education statistics.
Monday, December 10, 2012 at 10:13pm

business statistics
a state of indiana lotto ticket pays winners $0, $5, $25, and $200 with probabilities of 0.94, 0.03, 0.02, and 0.01 respectivley. the expected value of this ticket is
Monday, December 10, 2012 at 9:18pm

statistics
We take a simple random sample of 100 people and check their ages. Out of the 100, 15 are 65. What is the probability that the proportion of people over 65 in the entire population is between 13% and 17%? What error range can we guarantee with 90% certainty?
Monday, December 10, 2012 at 5:33pm

statistics
1997, a survey of 940 house holds showed that 15 of them use e-mail. Use those sample results to test the claim that more than 15 % of households use email. use a 0.05 significance level. which of the following is the hypothesis test to be conducted a. h0 :p=0.15 h1:p> 0....
Monday, December 10, 2012 at 3:57pm

Statistics of Psychology
Create a numerical and verbal hypothesis statement: People who are cyber bullied have, for the most part, been bullied in more traditional manners as well." Their research showed that the incidence increased over time, with 23 cases (56%) taking place between 2003 and ...
Sunday, December 9, 2012 at 8:37pm

Statistics
A tax specialist knows that tax refunds for people who use a firm to do their tax returns are normally distributed with a mean of $150 and a standard deviation of $43. The specialist believes that the company, Taxco, uses under trained staff and gets a lower average tax refund...
Sunday, December 9, 2012 at 7:46pm

Statistics
A number of grade school students were asked about their perceived math ability and the results are in the table below. Below Average = BA Average = A Above Average = AV BA A AV Girls 61 54 21 Boys 43 61 42 Test at the 0.01 level if there is a difference between girls and boys...
Sunday, December 9, 2012 at 2:43pm

Statistics
The data below represents six years of the harvest of oranges in millions of boxes and the price per 75 pound box. (a) Plot the data and calculate the regression line. Plot that line. (b)Calculate the coefficient of determination (c)What percent of the variation in price is ...
Sunday, December 9, 2012 at 2:39pm

Statistics
Cigarette companies advertise that the mean amount of nicotine in each cigarette is 1.4 milligrams. A health advocacy group believes that the amount of nicotine is greater than the advertised amount. They hire a consultant who collects a sample of size 31 and finds that it has...
Sunday, December 9, 2012 at 2:38pm

Statistics
18 workers at a large assembly plant were asked the time it took to commute to work. The data was analyzed in Minitab and the Descriptive Statistics for the data appears below. Descriptive Statistics: Minutes Variable N Mean Median TrMean StDev SE Mean Minutes 18 30.06 29.50 ...
Sunday, December 9, 2012 at 2:38pm

Statistics
Bottles of a popular cola contain a mean amount of 300 mL of cola. There is some variation from bottle to bottle because the filling machinery is not perfectly precise. The distribution of the contents is normal with a standard deviation of 3 mL. a) What is the probability ...
Sunday, December 9, 2012 at 2:37pm

Statistics
A provincial politician would like to determine the average amount earned during summer employment by the provinces teenagers during the past summer’s vacation period. She wants to have 95% confidence that the sample mean is within $25 of the actual population mean. Bases...
Sunday, December 9, 2012 at 2:37pm

Statistics
90% of the world’s large corporations are actively involved in data warehousing. In a random sample of 10 large corporations, what is the probability that at least 8 of them are actively involved in data warehousing.
Sunday, December 9, 2012 at 2:36pm

statistics
18 workers at a large assembly plant were asked the time it took to commute to work. The data was analyzed in Minitab and the Descriptive Statistics for the data appears below. Descriptive Statistics: Minutes Variable N Mean Median TrMean StDev SE Mean Minutes 18 30.06 29.50 ...
Sunday, December 9, 2012 at 11:38am

statistics
90% of the world’s large corporations are actively involved in data warehousing. In a random sample of 10 large corporations, what is the probability that at least 8 of them are actively involved in data warehousing
Sunday, December 9, 2012 at 11:37am

statistics
A provincial politician would like to determine the average amount earned during summer employment by the provinces teenagers during the past summer’s vacation period. She wants to have 95% confidence that the sample mean is within $25 of the actual population mean. Bases...
Sunday, December 9, 2012 at 11:33am

Statistics
3. A professor is interested in whether there is a difference in counseling students’ statistics competency scores among 1) those who have never taken any statistics course, 2) those who have only taken an undergraduate statistics course, 3) those who have taken COUN 503...
Sunday, December 9, 2012 at 10:25am

math
According to the statistics of a famous high school in Canada, all their graduates went to either A or B for university study. Following are the proportions of graduates who went to the two universities. University Proportion A 1-k B k Suppose k = 0.4 (a) What is the standard ...
Sunday, December 9, 2012 at 5:41am

statistics
Compare the 95%(6.214,7.686) and 99% 95.944,7.956)confidence intervals for the hours of sleep a student gets. Explain the difference between these intervals and why this difference occurs.
Saturday, December 8, 2012 at 10:55pm

statistics
Ramdom sample of 41 car owners results in a mean of 7 years. Population standard deviation of 3.75 years. Find a 95% confidence interval for the true population mean..My answer is (5.9, 8.1) but having problems with margin of error
Saturday, December 8, 2012 at 8:21pm

statistics
5) The lifetime of a medical device s a normally distributed rv with standard deviation of 2 years. An experiment is conducted to test 15 medical devices and find their lifetimes to be: a. If the population mean is known to be 15 years, what is the probability that the mean ...
Saturday, December 8, 2012 at 4:10pm

statistics
The latest in the "You may be a redneck if . . . " genre has produced a simple questionnaire. If more than 80% of the questions are answered in accordance with redneck"philosophy" (e.g., "You may be a redneck if grade 4 was the best 5 years of your ...
Saturday, December 8, 2012 at 3:55pm

statistics
Imagine that the probability of answering this question correctly is only p = .4, and on tests in which it is used, only 8 people attempt it. On what proportion of such tests will fewer than 3 people answer the question correctly?
Saturday, December 8, 2012 at 1:39am

Statistics
The amount of soda a dispensing machine pours into a 12 ounce can of soda follows a normal distribution with a standard deviation of 0.12 ounces. Every can that has more than 12.30 ounces of soda poured into it causes a spill and the can needs to go through a special cleaning ...
Friday, December 7, 2012 at 10:27pm

CRJ303-Statistics question
Re-worded from the "Study Questions" part of Chapter 5 from this site: "Student Study Site for Essentials of Social Statistics for a Diverse Society" Please show the steps for each question "When the Scholastic Aptitude Test (SAT) - now known as the ...
Friday, December 7, 2012 at 10:20pm

Probability Statistics
a manufacturing plant uses 3000 light bulbs whose lifetimes are independently normally distributed with mean 500 hrs, and standard deviation 50 hrs. to minimize the number of bulbs that burn out during production hours, all bulbs are replaced after given period of operation. ...
Friday, December 7, 2012 at 1:30pm

statistics
Scores from a statistics exam are reported as deviation scores. Which of the following deviation scores indicates a higher position in the class distribution?
Thursday, December 6, 2012 at 4:55pm

statistics
Experience in investigating insurance claims shows that the average cost to process a claim is approximately normally distributed with a mean of $80. New cost-cutting measures were started and a sample of 25 claims was tested. The sample mean of the costs to process these ...
Thursday, December 6, 2012 at 2:56pm

Statistics
A quality control inspector wants to estimate the mean inside diameter of the washers produced by a certain machine. A preliminary sample indicates that the inside diameters have a standard deviation of 0.30 millimeters. What sample size does he need to estimate the mean to ...
Thursday, December 6, 2012 at 9:59am

Math Statistics
If the range of a set of scores is 14 and the lowest score is 7, what is the highest score? Is it also 7 since 14- 7 = 7? Just asking.
Thursday, December 6, 2012 at 4:47am

statistics
The breaking strength (in pounds) of a certain new synthetic is normally distributed, with a mean of 165 and a variance of 9. The material is considered defective if the breaking strength is less than 156 pounds. What is the probability that a single, randomly selected piece ...
Thursday, December 6, 2012 at 2:27am

statistics
An organization sends a random sample of surveys to 100,000 people and received 4,781 responses. A) Give a 95% confidence interval for the true proportion of those from their entire mailing list who may donate.
Thursday, December 6, 2012 at 2:15am

statistics
Answer the following: (A) Find the binomial probability P(x = 5), where n = 12 and p = 0.70. (B) Set up, without solving, the binomial probability P(x is at most 5) using probability notation. (C) How would you find the normal approximation to the binomial probability P(x = 5...
Thursday, December 6, 2012 at 1:16am

Statistics
Keno
Wednesday, December 5, 2012 at 10:39pm

Statistics
Keno
Wednesday, December 5, 2012 at 10:38pm

Statistics
Records show that 29% of all payments to a mail-order company are submitted aftr the due date. Suppose 50 payments are submitted this week. Let r be a random variable that represents the number of payments that are late. Use the normal approximanition to the binomial to ...
Wednesday, December 5, 2012 at 5:31pm

statistics
If 30% of people in an area registered voters and 15 people are selected at ramdom from this area; a. What is the probability thatexactly 3out of the15 people are registered voters? b. What is the probability that at most 3 out of the 15 people are registered voters> c. ...
Wednesday, December 5, 2012 at 4:40pm

statistics
test the claim that less than 30% of the students in class own a car at the 0.10 significance level.
Wednesday, December 5, 2012 at 3:04pm

statistics
Give and interpret the 95% confidence interval for the hours of sleep a student gets. (7,8,4,5,8,10,7,8,5,6,7,4,7,8,9,8,7,6,7,8)
Wednesday, December 5, 2012 at 12:18pm

statistics
Assume a simple random sample has been taken, the conditions for binomial distribution are met and the sample proportions can be approximated by a normal distribution. In order to evaluate a course of therapy to treat brain tumors, a sample of 300 patients revealed that 96 ...
Wednesday, December 5, 2012 at 4:47am

statistics
8. Suppose that the IQ score for a person selected from a certain group of people is approximately N(; 100). Let X1;X2; : : : ;Xn be a random sample of such IQ scores. (a) How large should n be so that a 90% con dence interval for with maximum error " = 1 is [ ...
Wednesday, December 5, 2012 at 2:51am

Statistics
Please Help!!! I am having a small Problem Working this Problem. I am just not understanding. Could someone please assist? The lifetime of a brand of DVD player follows a normal distribution with a mean of 8 years and a standard deviation of 6 months. Find the probability that...
Wednesday, December 5, 2012 at 12:13am

Statistics
I need to know how to find the probability that z0 is greater than or equal to 2.40 using my TI-83+. The answer is .008200, but I don't know how to get that using my calculator. The only reason I know the answer is because it is an example from my homework. Please help! On...
Tuesday, December 4, 2012 at 2:50pm

statistics
What is the z-score for a test score of 440 in which the test has a normal distribution of N(400, 50)?
Tuesday, December 4, 2012 at 11:04am

statistics
Based on data from the National Health and Nutrition Examination Survey assume that the weights of men are normally distributed with a mean of 170 lbs. and a standard deviation of 30lbs. a. Find the probability that a man randomly selected from the above population will have a...
Monday, December 3, 2012 at 11:59pm

statistics
Scores on an English test are Normally distributed with a mean of 78% and a standard deviation of 4.5%. Find the Value of the first quartile.
Monday, December 3, 2012 at 9:51pm

Statistics
Commuters were asked how many times a week they stop for coffee on their way to work. A survey found a mean of 3 times a week with a standard deviation of 0.55. Find the probability that the sum of 121 values is less than 350.
Monday, December 3, 2012 at 6:41pm

Statistics and Probability
Commuters were asked how many times a week they stop for coffee on their way to work. A survey found a mean of 3 times a week with a standard deviation of 0.55. Find the probability that the sum of 100 values is more than 290.
Monday, December 3, 2012 at 6:41pm

Statistics and Probability
A survey shows that 25% of people listen to the radio daily. If a group of 125 people are surveyed, what is the probability that more than 40 people will have listened to the radio today?
Monday, December 3, 2012 at 6:39pm

statistics
Shoppers were asked how much money they were going to spend today in the mall. The mean dollars was $250 with a standard deviation of $15. In a group of 64 people, what is the probability that they spent less than $240?
Monday, December 3, 2012 at 6:36pm

statistics
Commuters were asked how many times a week they stop for coffee on their way to work. A survey found a mean of 3 times a week with a standard deviation of 0.55. What is the probability that in a group of 36 people they stop between 2.8 and 3.25 times per week?
Monday, December 3, 2012 at 6:34pm

Statistics
Of 5,352 requests for medical records, 4,256 were located in the 20-minute time frame established by the supervisor as a quality improvement indicator. What is the rate of compliance in answering requests for records?
Monday, December 3, 2012 at 5:57pm

statistics
Scores on the ACT college entrance exam are Normally distributed with a mean µ = 20 and standard deviation σ = 5. An SRS of 25 ACT scores is selected, construct a 95% Confidence Interval for the sample mean (X-Bar) and interpret your result.
Monday, December 3, 2012 at 11:48am

Statistics
Is is possible for the regression equation to have none of the actual (observed) data points located on the regression line?
Sunday, December 2, 2012 at 11:32pm

Statistics
If a research report contains the results of an independent measures ANOVA as follows: F(3,28) = 5.36, p<.01 the study only compared two groups rather than three correct?
Sunday, December 2, 2012 at 11:27pm

STATISTICS
A poll of 10 voters is taken in a large city. Let X be the number of voters in favor of candidate A for mayor. Suppose that 60% of all the city's voters favor this candidate. The mean and standard deviation are closest to
Sunday, December 2, 2012 at 9:46pm

statistics
Do you want to own your own candy store? Wow! With some interest in running your own business and a decent credit rating, you can probably get a bank loan on startup costs for franchises such as Candy Express, The Fudge Company, Karmel Corn, and Rocky Mountain Chocolate ...
Sunday, December 2, 2012 at 8:46pm

Statistics
Research Question for Parts 1 and 2: A health psychologist wants to study overall student health on a university campus. One measure he decides to take is that of minutes exercised per week. Assume that we know from previous studies that the population mean for minutes of ...
Sunday, December 2, 2012 at 8:37pm

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