Homework Help: Math: Statistics

Recent Homework Questions About Statistics

statistics
1. The table below presents data for a sample of people who completed a religious survey. Age Gender Denomination Church Attendance 56 1 7 4 46 2 6 5 49 2 6 5 49 1 1 5 27 2 9 5 51 1 4 2 47 2 2 3 67 1 5 4 49 2 2 6 33 1 12 6 55 2 9 5 40 1 7 5 62 1 8 6 47 2 6 3 56 2 9 5 22 1 10 ...
Monday, September 3, 2012 at 8:52pm

statistics
The lifetime of a 2 volt non- rechargeable battery has a normal distribution with a mean of 516 hours and a standard deviation of 20 hours.What is the z- score for batteries with lifetimes of 600 hours
Monday, September 3, 2012 at 7:01pm

statistics
The most common intelligence quotient (IQ) scale is normally distributed with mean 100 and standard deviation 15. What score would put a child 3 standard deviations above the mean
Monday, September 3, 2012 at 7:00pm

statistics
The cholestetol levels of young women aged 20 to 34 vary with a mean of 185 milligrams per decliter and standard deviation 39 mg/dl. What cholesterol level would be a young woman have in this age group if they were 2 standard deviations below the mean?
Monday, September 3, 2012 at 6:59pm

statistics
The lifetime of a 2 volt non-rechargeable battery has a normal distribution with a mean of 516 hours and a standard deviation of 20 hours. What is the z- score for batteries with lifetimes of 520 hours
Monday, September 3, 2012 at 6:38pm

statistics
For a population with a mean of 250 and a standard deviation of 47, return each of the following z scores to raw scores on this variable. a. 0.54 b. -2.66 c. -1.0 d. 1.79
Monday, September 3, 2012 at 1:42pm

Statistics
A conservative correction method for inflated "Alpha values" based on multiple comparisons being carried out independently on a specific data set, is known as...? A. Ad Hoc Testing B. Tukey's honestly significan differences (HSD) C. Post Hoc testing D. Bonferroni...
Sunday, September 2, 2012 at 9:04pm

Statistics
In conducting multiple regression analyses (MRAs), a major technical concern involves any high correlation of predictor (regressor) variables included in the model. The term for this is ....? A. Redundant predictors B. Close "knit" IVs C. Multicollinearity D. ...
Sunday, September 2, 2012 at 9:03pm

Statistics
Parametric procedures of quantitative analysis make an underlying assumption that...? A. Dichotomous variables have been "smoothed" B. The variables are measured at least at an ordinal level. C. All responses are measured in a mutually exclusive manner D. The ...
Sunday, September 2, 2012 at 9:01pm

Statistics
Analysis of Variance (ANOVA) results in the calculation of the F Statistic and interpretation of this statistics will inform you as to...? A. Which means significantly differ from the others. B. How the variables are associated with each other. C. Whether one or more of the ...
Sunday, September 2, 2012 at 9:00pm

Statistics
To make causal inferences from observed differences between groups based on varied levels of treatment, it is necessary to...? A. Find significant differences between groups at at-least the .05 level B. Use T-test or ANOVA procedures to conduct the analysis C. Have random ...
Sunday, September 2, 2012 at 8:58pm

Statistics
When conducting an inferential statistical analysis, and applying a conventional "critical p-value" of .05, the odds of making a Type I Error and "rejecting a true Null Hypothesis" is? A. 1 in 30 B. 1 in 100 C. 1 in 20 D. 1 in 10
Sunday, September 2, 2012 at 8:56pm

Statistics
Given that the Number of Grantees of a Driver's License in a small country in the month of April are .... 1,200 for professionsl 3,350 for non-professional 2,450 for students If you want to make a study of the correlation between driving habits and number of vehicular ...
Sunday, September 2, 2012 at 5:48am

math
I need some ideas for teaching statistics and probability to 4th graders
Saturday, September 1, 2012 at 12:38pm

statistics
A Dichotomous Variable represents what level of measurement within the realm of quantitative analysis?
Friday, August 31, 2012 at 5:21pm

statistics
The condition of scores being distorted in one direction or the other (towards the ends of the distribution) within a given distribution of data is known as
Friday, August 31, 2012 at 5:16pm

statistics
A source in the Internal Revenue Service has stated that historically 90% of federal tax returns filed are free of arithmetic errors. A random sample of 25 returns are selected and checked carefully for arithmetic errors. Assuming independence, find the probability that a. all...
Thursday, August 30, 2012 at 10:33pm

statistics
What would a person's numerical score be if someone scored two Standard Deviations above the Mean on a standardized test where the Mean = 100 and the Standard Deviation =15?
Thursday, August 30, 2012 at 7:32pm

statistics
A class test resulted in a mean score of 60% and a standard deviation of 15%. You scored 75%. Assuming the scores follow a normal distribution, and there are 200 in the class, how many students scored better than you? Give your answer to the nearest whole number.
Thursday, August 30, 2012 at 6:58pm

statistics
What formula is used to calculate the Standard Error of Measurement?
Thursday, August 30, 2012 at 5:08pm

statistics
What do independent trials in relationship to probability theory mean?
Thursday, August 30, 2012 at 5:06pm

statistics
A "Set" within quantitative theory represents ...?
Thursday, August 30, 2012 at 5:00pm

statistics
What particular measure of correlation would be most appropriate for use with two variables measured at an ordinal level?
Thursday, August 30, 2012 at 5:00pm

statistics
What are the defining characteristics of the Ratio Level of Measurement?
Thursday, August 30, 2012 at 4:56pm

Business Statistics
In each case, sketch the two speciﬁed normal curves on the same set of axes: a A normal curve with m 20 and s 3, and a normal curve with m 20 and s 6. b A normal curve with m 20 and s 3, and a normal curve with m 30 and s 3. c A normal curve with m 100 and s 10, and a ...
Thursday, August 30, 2012 at 1:48am

statistics
Can a percentile have the VALUE of 517? Can a percnetile have the VALUE -5.8? Can a percentile have the RANK 517? Can a percnetile have the RANK -5.8?
Wednesday, August 29, 2012 at 3:04pm

statistics
is it likely to arrive at a correct research conclusion after making an incorrect statistical conclusion?
Wednesday, August 29, 2012 at 1:36pm

ap stats
all students in a pe class completed a basketball free throw shooting event and the highest number of shots made was 32. the next day a student who had transferred into the school completed the event, making 35 shots. indicate whether adding the new student's score to the ...
Wednesday, August 29, 2012 at 12:22am

Statistics
If weight in the general population is normally distributed with an average of 160 and a standard deviation of 20 pounds, what is the probability of selecting someone who weights 120 or less or 170 or more pounds?
Tuesday, August 28, 2012 at 6:12pm

Statistics
Calculate the Pearson product-moment correlation for the data below. X 3 4 2 1 Y 5 5 3 4
Tuesday, August 28, 2012 at 6:12pm

statistics
A set of 50 data values has a mean of 15 and a variance of 36. Find the standard score of a data value = 30
Tuesday, August 28, 2012 at 2:32pm

Statistics
For a hypothetical normal distribution of test scores, approximately 95% fall between 38 and 62, 2.5% are below 38, and 2.5% are above 62. Given this information, (a) the mode=_____ and (b) the standard deviation=_____ Thanks in advance!
Tuesday, August 28, 2012 at 2:11pm

Economics
Brian is taking three courses this semester: economics, statistics, and finance. He has decided to spend 19 hours per week studying (in addition to attending all his classes) and his objective is to maximize his average grade, which means maximizing the total of his grades in ...
Monday, August 27, 2012 at 3:29pm

math statistics and probability
the set S={x|x^2+4x-5=0}
Sunday, August 26, 2012 at 8:10pm

math statistics and probability
A costumer has to buy a cell phone from an appliance store with 8 different brands. Each brand is available in 5 different colors, and 7 origins. how many choices can the sales lady offer the costumer?
Sunday, August 26, 2012 at 7:59pm

math statistics and probability
how many 4 digit number can be formed from the digits 2,3,5,,6,7,8 if: a.)each digit be only used once b) how many are even? c) how many are odd? d) how many are greater than 25000?
Sunday, August 26, 2012 at 7:55pm

Math: Statistics
Determine the smallest sample size required to estimate the population mean under the following specifications: a. e = 2.4 confidence level = 80% data between 50 and 150 d. e = 1.2 confidence level = 90%, data between 25 and 175
Sunday, August 26, 2012 at 1:03pm

math (statistics)
how many 4 digit number can be formed from the digits 2,3,5,,6,7,8 if: a.)each digit be only used once b) how many are even? c) how many are odd? d) how many are greater than 25000?
Saturday, August 25, 2012 at 11:27pm

math (statistics)
the set of integers between 1 and 50 divisible by 8
Saturday, August 25, 2012 at 11:24pm

math
STATISTICS The mean score for samantha's first s algebra quizzes was 88. If she scored a 95 on her next quiz, what will her mean score be for all 7 quizzes?
Saturday, August 25, 2012 at 10:59pm

math (statistics)
A costumer has to buy a cell phone from an appliance store with 8 different brands. Each brand is available in 5 different colors, and 7 origins. how many choices can the sales lady offer the costumer?
Saturday, August 25, 2012 at 10:29pm

math (statistics)
an experiment consistbnof tossing a die and then flipping a coin once if the number on the die is even. If the number on the die is odd, the coin is flipped twice. Using the notation 4H, for example to denote an event that die comes up 4 and then the coin comes up heads, and ...
Saturday, August 25, 2012 at 9:49pm

Statistics
An instructor has graded 25 exam papers submitted by students in a class of 26 students, and the average so far is 71. (The maximum possible score is 100.) A) To raise the class average by 1 point, the score on the last paper has to be:
Saturday, August 25, 2012 at 5:57pm

statistics/ Help!-thanks!
The producers of a new toothpaste claim that it prevents more cavities than other brands of toothpaste. A random sample of 60 people use the new toothpaste for 6 months. The mean number of cavities at their next check up is 1.5. In the general population the mean # of cavities...
Saturday, August 25, 2012 at 4:28pm

statistics
how many ounces of butt woulld one have used if you use 81% out of countainer of 1.45kg of butter
Saturday, August 25, 2012 at 2:21am

statistics
7. (TCO 6) Find P(11 < x < 16) when mu = 15 and sigma = 3. (Points : 3)
Saturday, August 25, 2012 at 12:31am

statistics
how do you design an experiment that uses a repeated measures design
Thursday, August 23, 2012 at 9:28pm

writing skills
15. The World Almanac is a book of A. living notable Americans. [B. facts and statistics.] C. synonyms. D. articles published in magazines
Thursday, August 23, 2012 at 7:19pm

statistics
A machine used in a production process is set up correctly 97% of the time. Given that the machine is set up correctly, only 5% of its items it produces are defective, while 95% are not defective. On the other hand, if the machine is set up incorrectly, 60% of the items it ...
Thursday, August 23, 2012 at 10:53am

statistics
Alice has measured the hemoglobin levels of 200 people. If the data follows a normal distribution with a mean of 10 and a standard deviation of 1, what can you conclude?
Thursday, August 23, 2012 at 12:53am

statistics/ Help!
What is the probability of pulling a heart from a standard (52-card) deck of playing cards? A. .25 B. .50 C. .75 D. 1.0 Thanks very much!
Tuesday, August 21, 2012 at 4:58pm

statistics
Suppose the mean height of a population is 65 inches with a standard deviation of 1.5 inches. What is the z value for a height (x) of 67 inches?
Saturday, August 18, 2012 at 4:20pm

statistics
A random sample of 84 shoppers were interviewed and 51 said they prefer to shop alone rather than with someone such as friends or family. Let p represent the proportion of all shoppers at this mall who would prefer to shop alone. Find a point estimate for p from the sample ...
Friday, August 17, 2012 at 5:26pm

statistics
Faculty in the psychology department at APUS consume an average of 5 cups of coffee per day with a standard deviation of 1.5. The distribution is normal. How many cups of coffee would an individual at the 25th percentile drink per day? A. 4 B. 5 C. 6 D. 7
Wednesday, August 15, 2012 at 12:35pm

statistics
In a psychology class of 100 students, test scores are normally distributed with a mean of 80 and a standard deviation of 5. Approximately what percentage of students have scores between 70 and 90? A. 68% B. 80% C. 95% D. 99%
Wednesday, August 15, 2012 at 12:34pm

Business Statistics
10.55 Consider an experiment with four groups, with eight values in each. For the ANOVA summary table below, fill in all the missing results: A) Source B) Degrees of Freedom C) Sum of Squares D) Mean Square (Variance) E) F 1A) Among Groups 1B) c - 1 = ? 1C) SSA = ? 1D) MSZ = ...
Tuesday, August 14, 2012 at 11:04pm

statistics
The heights of young women are approximately normal with a mean 64.5 in and a standard deviation of 2.5 in. What is the probability that a woman chosen at random is taller than 63.6 inches?
Tuesday, August 14, 2012 at 9:51pm

statistics
For normal population mean 60, standard deviation 15, after treatment is given to the member of sample , the sample mean is 65, and sample size is 25. is the sample mean sufficient to conclude that the treatment has significant effect? Give reason for decision?
Saturday, August 11, 2012 at 11:38pm

statistics
A vending machine dispenses coffee into a twelve-ounce cup. The amount of coffee dispensed into the cup is normally distributed with a standard deviation of 0.05 ounce. You can allow the cup to overfill 4% of the time. What amount should you set as the mean amount of coffee ...
Saturday, August 11, 2012 at 9:31pm

statistics (math)
The following equation can be used to predict the average height of boys anywhere between birth and 15 years old: y = 2.79x +25.64 where x is the age (in years) and y is the height (in inches). a. What does the slope represent in this problem? Interpret it in context. b. What ...
Thursday, August 9, 2012 at 11:45pm

statistics
Q) 75% of the population in Guinea, Africa is infected with malaria. Suppose a physician sees 6 patients in a given hour. Assuming these conditions are met, find the mean and standard deviation of the distribution. Help please!
Thursday, August 9, 2012 at 1:52am

statistics
The number of column inches of classified advertisements appearing on Mondays in a certain daily newspaper has mean 320 inches and standard deviation 30 inches. Suppose that the results for 100 consecutive Mondays can be regarded as a random sample and let J denote the mean ...
Wednesday, August 8, 2012 at 6:50pm

statistics
Automobile racing, high-performance driving schools, and driver education programs run by automobile clubs continue to grow in popularity. All these activities require the participant to wear a helmet that is certified by the Snell Memorial Foundation, a not-for-profit ...
Wednesday, August 8, 2012 at 1:34pm

statistics
using excel to simulate probablilty, what uncertainties about the results would exist?
Tuesday, August 7, 2012 at 2:54pm

basic statistics
What is construct a 95 percent confidence interval about the sample mean N= 11?
Monday, August 6, 2012 at 7:58pm

Statistics
Can you show me how to figure out a sample size of N=60? What would the equation look like and how would I explain it to a class?
Thursday, August 2, 2012 at 8:13pm

statistics
A bag contains five purple ("P") blocks and one yellow ("Y") blocks. Without looking into the bag you reach in, take out a block, return the block to the bag, and then repeat the same process a number of times. Which of the following sequences of selected ...
Thursday, August 2, 2012 at 3:38pm

Statistics
Exponential distribution was used to model the lengths of CD-ROM drives in a two drive system. The two CD-ROM drives operate independently, and at least one drive must be operating for the sytem to eperate successfully. Both drives have a mean length of life of 25,000 hours. A...
Thursday, August 2, 2012 at 11:46am

Statistics
A random sample of customer incomes yields a mean income of $35000 with a standard deviation of $4500. Assume that the distribution of the incomes in normal. What income range would include 90% of the most popular incomes?
Thursday, August 2, 2012 at 11:27am

Statistics
A random sample of forty-eight 200 meter swims has a mean of 3:12 minutes and a standard deviation of .09 minute. Construct a 95% confidence interval for the population mean time. I know u: 3.12, sx: .09, n:48, c:.95 What is the formula I use to find the answer? Can anyone ...
Wednesday, August 1, 2012 at 9:10pm

Statistics
What percentage of college students are attending a college in the state where they grew up? Let p be the proportion of college students from the same state as that in which the college resides. If no preliminary study is made to estimate p, how large a sample is needed to be ...
Wednesday, August 1, 2012 at 1:40pm

statistics
A researcher wants to carry out a hypothesis test involving the mean for a sample of n = 20. While the true value of the population standard deviation is unknown, the researcher is reasonably sure that the population is normally distributed. Given this information, which of ...
Tuesday, July 31, 2012 at 2:35am

statistics
In a time-use study, 20 randomly selected managers were found to spend a mean of 2.40 hours each day on paperwork. The standard deviation of the the 20 scores is 1.30. Also, the sample data appear to have a bell-shaped distribution. Construct the 95% confidence interval for ...
Monday, July 30, 2012 at 12:47pm

statistics
The National Center for Education surveyed 4400 college graduates about the lengths of time required to earn their bachelor's degrees. The sample mean is 5.15 years, and assume that standard deviation is known to be 1.68 years. Based on the sample data, construct the 99% ...
Monday, July 30, 2012 at 9:31am

statistics
In a normal distribution with the mean being 500 and the standard deviation being 100, what raw score separates the top 40% of a distribution from the rest?
Sunday, July 29, 2012 at 11:48pm

statistics
Drivers pay an average of (mean $690) per year for automobile insurance the distribution of insurance payments is approximately normal with a standard deviation of 110 dollars. What proportion of drivers pay more than 100 dollars per year for insurance?
Sunday, July 29, 2012 at 11:48pm

statistics
Assume that women's heights are normally distributed with a mean=63.6 in. and standard deviation = 2.5 in. a) To be eligible for the US Marine Corps, a woman must have a height between 58 in. and 73 in. Find the percentage of women who satisfy that requirement. b)If the ...
Sunday, July 29, 2012 at 11:31pm

statistics
According to a Harris Interactive poll conducted in 2009, 20% of American adults smoke. In a random sample of 500 American adults, what is the probability that no more than 100 smoke?
Saturday, July 28, 2012 at 2:53pm

statistics
it is stated that the standard deviation sample of the is 7.6 (n = 26). Test the claim to a significance level of 0.10 that the population standard deviation was greater than 7.0. Round all answers to 3 decimal places.
Saturday, July 28, 2012 at 1:40pm

statistics
Expected relative frequency probability represents a calculated probability based on large numbers of trials. In an example of a deck of 52 cards, where you randomly pull cards from the deck and record what they are, you find that over 1000 random draws, you pull an ACE 76 ...
Saturday, July 28, 2012 at 12:24pm

Hypothesis - Statistics
At one school, the average amount of time that tenth-graders spend watching television each week is 18.4 hours. The principal introduces a campaign to encourage the students to watch less television. One year later, the principal wants to perform a hypothesis test to determine...
Saturday, July 28, 2012 at 12:18pm

statistics
The number of cell phone minutes used by high school seniors follows a normal distribution with a mean of 500 and a standard deviation of 50. What is the probability that a student uses more than 350 minutes?
Saturday, July 28, 2012 at 10:32am

statistics
5 to the third power (i.e., 5x5x5) would equal
Saturday, July 28, 2012 at 10:05am

statistics
An extreme score that sets apart in value from the general distribution of values with which it is connected is known as…?
Saturday, July 28, 2012 at 9:43am

statistics
(3,5,7,9,11)U(3,6,9,12,15) would correctly be expressed as
Saturday, July 28, 2012 at 9:39am

statistics
Surgery vs. placebo for the knee pain: Refer to Example 10. Is Arthroscopic Surgery Better than Placebo? Here we show MINITAB output comparing mean knee pain scores for the placebo (group 1) to debridement arthroscopic surgery (group 2). a) State and interpret the result of ...
Saturday, July 28, 2012 at 1:04am

statistics
A rental agent claims that the mean monthly rent, u , for apartments on the east side of town is less than $675. A random sample of 21 monthly rents for apartments on the east side has a mean of $674, with a standard deviation of $18. If we assume that the monthly rents for ...
Friday, July 27, 2012 at 7:41pm

system analysis and palnning
objective The Milestone Assignments are based on the Projects and Cases for use with the Systems Analysis and Design Methods textbook by Whitten & Bentley. There are six (6) parts to the Project, consisting of twelve (12) milestones. During Weeks 2-7, you will be required to ...
Thursday, July 26, 2012 at 11:07pm

Statistics
A regression equation was calculated and is given below. The values for Miss America are values such as 0, 1, 2, 3, 4, etc. Regression Analysis: GPA versus Miss America The regression equation is GPA = 3.32 - 0.0890 Miss America b. What is the response variable? The values of ...
Thursday, July 26, 2012 at 2:54pm

Statistics
A researcher wants to see if gender plays a role in where we sit in a restaurant. An analysis of survey data yields the following contingency table, chi-squared value, and p-value: Tabulated statistics: Gender, Seating Rows: Gender Columns: Seating Back Front Middle All Female...
Thursday, July 26, 2012 at 2:34pm

Statistics
Given the sample mean of GPA, the sample SD, and the SE below: SM: 3.2454 SD: 0.4635 SE: 0.0309 construct a 99.7% confidence interval for the population mean gpa. My answer: 3.2145 to 9.6435
Thursday, July 26, 2012 at 1:57pm

Statistics
Given the sample mean of GPA, the sample SD, and the SE below: SM: 3.2454 SD: 0.4635 SE: 0.0309 construct a 68% confidence interval for the population mean gpa My answer is: 0.4635 to 3.7089
Thursday, July 26, 2012 at 1:56pm

Statistics
write a paper that involves designing, conducting, and analyzing results from your own experiment to test the sensory discrimination of one of your friends. Choose a friend who claims to be able to tell the difference between two very similar objects.
Wednesday, July 25, 2012 at 9:39pm

statistics
DOES ANYONE EVEN ANSWER THESE HOMEWORK CHECKS?I have posted 3 or 4 Q/A and no one answers---any other sites better???
Wednesday, July 25, 2012 at 8:45pm

statistics
DOES ANYONE EVEN ANSWER THESE HOMEWORK CHECKS?I have posted 3 or 4 Q/A and no one answers---any other sites better???
Wednesday, July 25, 2012 at 5:11pm

statistics
Given the sample mean of GPA, the sample SD, and the SE below: SM: 3.2454 SD: 0.4635 SE: 0.0309 constructa 95% confidence interval for the population mean gpa? my answer: 3.2454+0.0309 = 3.2763-0.0.0309=1.2454
Wednesday, July 25, 2012 at 5:06pm

STATISTICS(NEED HELP PLEASE?)
Consider the following set of data. (25, 6), (25, 51), (62, 34), (84, 15), (112, 57), (122, 14) (a) Calculate the covariance of the set of data. (Give your answer correct to two decimal places.) 40.17 (b) Calculate the standard deviation of the six x-values and the standard ...
Wednesday, July 25, 2012 at 3:00pm

STATISTICS
2. Are the student final exam scores in classroom A significantly different than the average of classroom B, 80%? Provide the IV, DV, and best method of analysis. (Points : 6)
Wednesday, July 25, 2012 at 1:31pm

statistics
1. How do the 3rd grade boys’ weight in Principal Ben’s school compare to the national average (mean weight = 90, sd =15)? Provide the IV, DV, and best method of analysis
Wednesday, July 25, 2012 at 1:22pm

statistics
Given that x is a normally distributed random variable with a mean of 60 and a standard deviation of 10, find the P(56 < x <74). Please show all your work and write your answer in a complete sentence. Using the information from question 1, what percentage of the ...
Monday, July 23, 2012 at 10:41pm

Statistics
The amount of a monthly phone bill is normally distributed with a mean of $60 and a standard deviation of $12. Fill in the blanks: 68% of her phone bills are between $______________ and $______________.
Monday, July 23, 2012 at 7:53pm

Statistics
The annual precipitation for one city is normally distributed with a mean of 72 inches and a standard deviation of 3.5 inches. In 95% of the years, the precipitation in this city is between___ and ___
Monday, July 23, 2012 at 7:51pm

statistics
One of the problems with a study such as this one is the small size of the samples. If you wanted to estimate the proportion of a certain color of candy to within 2% of the actual proportion, how many individual pieces of candy must you sample? Assume you want to be 90% ...
Monday, July 23, 2012 at 12:25pm

statistics
) 43% of adults receive phone calls during the day. Amongst 10 randomly selected people find the probability that a. Adults receive exactly 4 phone calls. b. Adults receive 8 or more phone calls.
Sunday, July 22, 2012 at 11:39pm

statistics
You intend to estimate a population proportion with a confidence interval. The data suggests that the normal distribution is a reasonable approximation for the binomial distribution in this case. Find the critical value that corresponds to a confidence level of 98%. (Report ...
Sunday, July 22, 2012 at 9:22pm

statistics
Assume that a sample is used to estimate a population proportion p. Find the margin of error M.E. that corresponds to a sample of size 344 with 96 successes at a confidence level of 98%.
Sunday, July 22, 2012 at 9:15pm

Statistics
The confidence interval below for the population variance is based on the following sample statistics: n = 25, x-bar = 31.1, and s = 4.2. 9.29 < standard deviation squared < 42.82 What is the degree of confidence?
Sunday, July 22, 2012 at 6:52pm

statistics
this is to mathmate...this is jimmy and you answered by questions on random sample and probability (better business bureau question)..i greatly appreciate your help but i do not understand part b and d answers..i am totally lost on this whole question
Sunday, July 22, 2012 at 6:12pm

statistics
The Better Businesss Bureau reports that they resolve 70% of the consumer complaints they receive. a) if a random sample of 5 consumer complaints is selected, what is the probability that all 5 were resolved? b)if a random sample of 5 consumer complaints is selected, what is ...
Sunday, July 22, 2012 at 5:11pm

statistics
A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time students spent studying per week. Assuming a population standard deviation of 6 hours, what is the required sample size if the error should be less than &...
Sunday, July 22, 2012 at 5:09pm

math
assume that a sample is used to estimate a population proportion p. find the margin of error E that corresponds to the given statistics and confidence level. 98% confidence, the sample size is 780, of which 40% are successes what does that mean in English?
Sunday, July 22, 2012 at 11:15am

statistics
for the following data calculate the sampling distribution parameters where, µ=120 ó=unknown,s=18,n=36, how can we find E[M] and SE[M]
Sunday, July 22, 2012 at 9:47am

statistics
6 16 12 10 18 using this data find the precentile rate of 16
Sunday, July 22, 2012 at 12:26am

Statistics
A sociologist is interested in the relations between x = number of job changes and y = annual salary (in thousands of dollars) for people living in the Nashville area. A random sample of 10 people employed in Nashville provided the following information. x (Number of job ...
Saturday, July 21, 2012 at 10:06pm

Statistics
Suppose you and a friend each take different random samples of data pairs (x,y) from the same population. Assume the samples are the same size. Based on your samples, you compute r = 0.83. Based on her sample your friend computes 0.79. Is your friend’s value for r wrong? ...
Saturday, July 21, 2012 at 9:55pm

statistics
A manager for a firm that sells advertising space in magazines and periodicals is considering a number of new initiatives to recognize high-performing members of her sales force. Assume that the annual sales revenue for members of her sales force is normally distributed with a...
Saturday, July 21, 2012 at 1:41am

statistics
a pool of potential jurors consists of 10 men and 30 women. if three different people are randomly selected from this pool (without replacement), find the probibility that they are all men,
Friday, July 20, 2012 at 10:45pm

Statistics
The probability that a radish seed will germinate is 0.6. Estimate the probability that of 130 randomly selected seeds, exactly 90 will germinate. Note: I keep getting the answer wrong.
Friday, July 20, 2012 at 5:47pm

Statistics
Why do we use Z score to build on confidence intervals rather than t score?
Friday, July 20, 2012 at 3:57pm

statistics
A telephone company representative estimates that 40% of its customers use voice mail. To test this hypothesis, she selected a sample of 100 customers and found that 37 used voice mail. At a standard deviation of 0.01, is there enough evidence to show the proportion differs ...
Thursday, July 19, 2012 at 9:31pm

statistics
3. Measurements on the percentage of enrichment of 12 fuel rods used in a nuclear reactor were reported as follows; 3.11 2.88 3.08 3.01 2.84 2.86 3.04 3.09 3.08 2.89 3.12 2.98 a. Test the Hypothesis H0: µ = 2.95 versus H1: µ 0 ≠ 2.95, and draw appropriate ...
Thursday, July 19, 2012 at 10:58am

Statistics
A researcher claims that at least 10% of all football helmets have manufacturing flaws that could potentially cause injury to the wearer. A sample of 200 helmets revealed that 24 helmets contained such defects. a. Does this finding support the researcher’s claim? Used a ...
Thursday, July 19, 2012 at 10:57am

statistics
a survey from teeneage research unlimited found that 30% of teenage consumers receive their spending money from parttime jobs. If 5 teenagers are selected at random, find the probability that at least 3 of them have part time jobs
Thursday, July 19, 2012 at 6:46am

statistics
So if a scale has 30 items in it, and if an individual gets a score of 20 what does this mean? The only way to answer this is to look at the standardization sample, find out what the mean score in the sample was, let's say 15, and standard deviation in the population was ...
Wednesday, July 18, 2012 at 7:55pm

statistics
If the null hypothesis for the example survey posted is "There is no correlation between level of drug use and satisfaction with one's personal life." What are the three possible alternative hypotheses that could be stated, using only the variables and ...
Wednesday, July 18, 2012 at 7:38pm

statistics
So if a depression scale has 30 items in it, and if an individual gets a score of 20 what does this mean? The only way to answer this is to look at the standardization sample, find out what the mean score in the sample was, let's say 15, and standard deviation in the ...
Wednesday, July 18, 2012 at 7:19pm

Statistics
cant tell if i am on right track for this prababilitly hw assigment help would good! I was recently given a hw assigment dealing with the price is right's "money game". The contestant is shown nine cards on a board. Each card has one pair of numbers. One card has...
Wednesday, July 18, 2012 at 6:27pm

Statistics
Measurements on the percentage of enrichment of 12 fuel rods used in a nuclear reactor were reported as follows; 3.11 2.88 3.08 3.01 2.84 2.86 3.04 3.09 3.08 2.89 3.12 2.98 a. Test the Hypothesis H0: µ = 2.95 versus H1: µ 0 ≠ 2.95, and draw appropriate ...
Wednesday, July 18, 2012 at 3:57pm

Statistics
a. In a random sample of 500 observations , we found the proportion of successes to be 48%. Estimate with 95% confidence the population proportion of successes. B. Repeat part (a) with N=200 C. Repeat part (a) with N=1000 I need to know how to do this in excel?
Tuesday, July 17, 2012 at 11:45pm

Statistics
A normally distributed population has a mean of 40 and a standard deviation of 12. What does the central limit theorem say about the sampling distribution of the mean if samples of size 100 are drawn from this population.
Tuesday, July 17, 2012 at 11:26pm

Statistics
An ESP experiment is done in which a participant guesses which of 8 cards the researcher has randomly picked, where each card is equally likely to be selected. This is repeated for 200 trials. The null hypothesis is that the subject is guessing, while the alternative is that ...
Tuesday, July 17, 2012 at 7:12pm

Probability and Statistics
For questions 6 - 10 use the chi-squared distribution to test the hypothesis. 6) A restaurant owner wants to see if the business is good enough for him to purchase a restaurant. He asks the present owner for a breakdown of how many customers that come in for lunch each day and...
Monday, July 16, 2012 at 9:11pm

Probability and Statistics
For questions 1- 5 use confidence intervals to test the hypothesis. 1) A light bulb producing company states that its lights will last an average of 1200 hours with a standard deviation of 200 hours. A sample of 100 light bulbs from the company were tested and the researcher ...
Monday, July 16, 2012 at 9:10pm

Statistics
You are getting ready to take a sample from a large population, and need to determine the appropriate sample size. You are estimating sales at a large chain of department stores. A previous survey from the same population found a standard deviation of $18. What sample size is ...
Monday, July 16, 2012 at 12:29pm

statistics
A random sample of size 81 is taken from a large population, measuring the time it takes to complete a driver’s license examination. The sample mean was found to be 43 minutes, and the sample standard deviation 5.71 minutes. Construct a 95% confidence interval around the ...
Monday, July 16, 2012 at 12:27pm

Statistics
The state lottery claims that its grand prize is $1 million. The lucky winner will receive $50,000 upon presentation of the winning ticket plus $50,000 at the end of each year for the next 19 years. Why isn't this really a million-dollar prize? What would it actually be ...
Sunday, July 15, 2012 at 3:00pm

math statistics
For each probability and percentile problem, draw the picture. A random number generator picks a number from 1 to 9 in a uniform manner. 1) Give the distribution of X. X = 2) Enter an exact number as an integer, fraction, or decimal. f(x) = where <=x=> 3) Enter an exact ...
Sunday, July 15, 2012 at 1:50pm

statistics
if the mean is 250mg and the standard deviation is 75mg and 2% goes either right or left, what formula do i use to come out with a normal curve?
Sunday, July 15, 2012 at 12:18pm

statistics
The probability that a house is burglarized in the city is 5%. If 50 houses are randomly selected, what is the probability that none will be burglarized?
Saturday, July 14, 2012 at 9:15pm

Statistics
A local fire station receives an average of 0.5 rescue calls per day. Find the probability that on a randomly selected day, the fire station will receive fewer than two calls.
Friday, July 13, 2012 at 8:57pm

statistic
1.The state highway patrol stops every 5th car on highway 210 to check drivers' licenses and registrations. Which sampling technique are they using? systematic sampling -chose this one convenience sampling cluster sampling simple random sampling stratified sampling 2.You ...
Friday, July 13, 2012 at 6:56am

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