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April 24, 2014

Homework Help: Math: Statistics

Recent Homework Questions About Statistics

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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

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 9:18am

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 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 8:36pm

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
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 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
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 11:37am

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
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 9:35pm

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
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
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 8:45pm

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

statistics
say that you have a distribution of exam scores with a mean of 57 and a standard deviation of 7. if a student in the class has a standard score equal to 2.429, what would their raw score on the exam be?
Sunday, December 2, 2012 at 4:54pm

statistics
Refer to the Baseball data, which report information on the 30 Major League Baseball teams for the 2010 season. Let the number of games won be the dependent variable and the following variables be independent variables: team batting average, number of stolen bases, number of ...
Sunday, December 2, 2012 at 3:47pm

Statistics
You are wondering whether male or female students pay more for books and materials at the U of C. You find 5 male friends at the U of C and find that they spent an average of $680 with a standard deviation of $5. You find 4 female friends at the U of C and find that they spent...
Sunday, December 2, 2012 at 1:13pm

Statistics
Tony’s father, an accountant, has been listening to Tony tell him about Type I errors and α = .05. He responds: “.05? That means you’re making an error one time in twenty! If I made errors 5 percent of the time I’d be out of a job so fast it would make...
Sunday, December 2, 2012 at 1:11pm

Statistics
Consider a machine that fills soda bottles. The process has a mean of 15.9 ounces and a standard deviation of 0.06 ounces. The specification limits are set between 15.8 and 16.2 ounces. a)Compute and interpret the machine’s Cp Cp = process capable b)Compute and interpret ...
Sunday, December 2, 2012 at 12:08pm

statistics
Consider a machine that fills soda bottles. The process has a mean of 15.9 ounces and a standard deviation of 0.06 ounces. The specification limits are set between 15.8 and 16.2 ounces. a)Compute and interpret the machine’s Cp b)Compute and interpret the machine Cpk c)...
Sunday, December 2, 2012 at 11:01am

statistics
historically, the mean timr to complete this statistics test is 54 minutes with a standard deviation of 9 minutes. how much time should i allow, if my goal is for 95% of the students to be able to complete this test
Saturday, December 1, 2012 at 11:36pm

Statistics
62.Refer to the Baseball 2009 data, which report information on the 30 Major League Baseball teams for the 2009 season. a. At the .05 significance level, can we conclude that there is a difference in the mean salary of teams in the American League versus teams in the National ...
Saturday, December 1, 2012 at 9:11pm

statistics
sample size needed with a mean of 100,standard deviation of 20 for the the population of normal adults an iq range to fall between 2 iq points with 95% confidence interval
Saturday, December 1, 2012 at 10:57am

psychology -statistics
why can we use the same multiple comparison procedures for between subjects, repeated measures, and mixed designs without changing the formulas
Friday, November 30, 2012 at 11:57pm

Statistics
Explain how the error term in a repeated measures ANOVA is actually an interaction
Friday, November 30, 2012 at 11:03pm

Statistics
Explain how the error term in a repeated measures ANOVA is actually an interaction
Friday, November 30, 2012 at 10:59pm

statistics
Find the z-score for the standard normal distribution where: P(z< -a) = 0.2451
Friday, November 30, 2012 at 10:26pm

Statistics
What is the appropriate sample size for a confidence interval around the sample mean if you want a margin of error of 0.8 with 95% confidence and a population standard deviation of 12.
Friday, November 30, 2012 at 10:05pm

statistics
Working on "Inferences from Dependent Samples" trying to find the standard deviation of the difference data. Differences: 24, 53, 100, 40, -10,71,77,70, 39, 50 n=10 d=51.4 sd=??? (Answer suppose to be 30.8336 but not coming close to this number at all)
Friday, November 30, 2012 at 8:31pm

Statistics
The time per week a student uses a lab computer is normally distributed, with a mean of 6.2 hours and a standard deviation of 0.9 hour. A student is randomly selected. a. Find the probability that a student uses a lab computer less than 4 hours per week. b. Find the ...
Friday, November 30, 2012 at 4:53pm

statistics
How to convert VB2008 project in Windows Application (*.exe file)?
Friday, November 30, 2012 at 3:30pm

statistics
Suppose 100 randomly selected customers were asked to rate a particular service they recently had on a scale of 0 to 10. The sample mean rating was found to be 7.3. (Assume the population standard deviation of all ratings in the population of customers is 0.8.) Using all this ...
Thursday, November 29, 2012 at 5:09pm

statistics
Suppose 100 randomly selected customers were asked to rate a particular service they recently had on a scale of 0 to 10. The sample mean rating was found to be 7.3. (Assume the population standard deviation of all ratings in the population of customers is 0.8.) Using all this ...
Thursday, November 29, 2012 at 5:09pm

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!
Thursday, November 29, 2012 at 10:31am

statistics
. A certain researcher thinks that the proportion of women who say that female bosses are harshly critical is greater than the proportion of men. In a random sample of 200 women, 27% said that female bosses are harshly critical. In a random sample of 220 men, 25% said that ...
Wednesday, November 28, 2012 at 5:29pm

statistics
3. A researcher is interested in comparing the Christian maturity level of students who volunteer for community service versus those who do not. The researcher assumes that those who perform community service will have higher Christian maturity scores. The maturity scores tend...
Tuesday, November 27, 2012 at 11:22pm

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