Friday

April 25, 2014

April 25, 2014

Number of results: 16,846

**Statistics: Sample Size, Variance and Standard Dev**

Sample Size, Variance and Standard Deviation A student organization plans to ask 100 randomly selected students how much they spent on textbooks last semester. You argue for a sample of 900 students instead of 100. You know the standard deviation of the sample mean x of the ...
*Tuesday, September 11, 2007 at 4:26pm by Carma*

**Research and Statistics**

What factors influence the size of the t-statistics( mean difference, variance, sample size) and which way?
*Monday, February 10, 2014 at 1:47pm by Erica*

**statistics**

Suppose we take a random sample of size n from a normal population with variance, σ2 . It can be shown that (n−1)s2/σ2 has a chi-square distribution with n−1 degrees of freedom, where s is the sample variance. Below is a random sample of size 8 drawn from...
*Monday, March 18, 2013 at 12:32am by sandy*

**statistics**

A random sample of n=16 scores is obtained from a population with a mean of µ= 80 and a treatment is administered to the sample. After treatment, the sample mean is found to be M=82. a)Assuming the sample contained n=16 individuals, measure the size of the treatment effect by ...
*Wednesday, March 5, 2008 at 12:30am by Laurie*

**business statistics**

A random sample of size 15 taken from a normally distributed population reveled a sample mean of 75 and a sample variance of 25. The upper limit of a 95% confidence interval for the population mean would equal?
*Saturday, August 1, 2009 at 11:27am by Samantta*

**Statistics**

Are these statements true or false? 1. The sample mean, the sample proportion and the sample standard deviation are all unbiased estimators of the corresponding population parameters. 2. If the population is normally distributed with known variance then the sample mean may not...
*Friday, November 5, 2010 at 5:03pm by help*

**statistics**

Let X be the average of a sample of size 25 independent normal random variables with mean 0 and variance 1. P[[X<c]=0.5 (a) Determine c such that (b) Now assume that the observations may not be normally distributed, but they still are independent with mean 0 and variance 1...
*Wednesday, November 23, 2011 at 11:17am by zwesko*

**Statistics**

A normal population has an expected value of 60 and a variance of 30. Use the central limit theorem to determine what the sample size should be such that the mean has a probability of 90% to fall between the values 58 and 62. One concept of the Central Limit Theorem is ...
*Thursday, August 10, 2006 at 2:06am by ruth*

**STATISTICS**

According to the Central Limit Theorem, The traditional sample size that separates a large sample size from a small sample size is one that is greater than 100 30 500 20
*Thursday, June 10, 2010 at 6:09pm by John*

**STATISTICS**

WHAT DOES THE CENTRAL LIMIT THEOREM SAY ABOUT THE TRADITIONAL SAMPLE SIZE THAT SEPARATES A LARGE SAMPLE SIZE FROM A SMALL SAMPLE SIZE?
*Thursday, July 18, 2013 at 9:35pm by LINDA*

**Statistics**

An IQ test is designed so that the mean is 100 and the standard deviation is 19 for the population of normal adults. Find the sample size necessary to estimate the mean IQ score of statistics students such that it can be said with 95% confidence that the sample mean is within ...
*Wednesday, February 12, 2014 at 10:12pm by Stephanie*

**Statistics**

Suppose that the fit to the simple linear regression of Y on X from 6 observations produces the following residuals: -3.3, 2.1, -4.0, -1.5, 5.1, 1.6. a) What is the estimate of sigma squared? b) What is the estimate of sigma? c) What are the degrees of freedom? Sigma = ...
*Wednesday, March 14, 2007 at 7:39pm by MMK*

**Statistics**

SAT scores are normally distributed with a mean of 500 and a standard deviation of 100. Using the formula for ÏƒM, what will ÏƒM be when a. the sample size is 25 b. the sample size is 121, and c. the sample size is 400?
*Monday, November 18, 2013 at 8:04pm by Mikos*

**elementary statistics**

A statistics professor is used to having a variance in his class grades of no more than 100. He feels that his current group of students is different, and so he examines a random sample of midterm grades (listed below). At 0.05 alpha level can it be conculded that the variance...
*Saturday, November 30, 2013 at 7:44pm by David*

**elementary statistics**

A statistics professor is used to having a variance in his class grades of no more than 100. He feels that his current group of students is different, and so he examines a random sample of midterm grades (listed below). At 0.05 alpha level can it be conculded that the variance...
*Saturday, November 30, 2013 at 10:30pm by David*

**statistics**

Let’s assume you have taken 100 samples of size 36 each from a normally distributed population. Calculate the standard deviation of the sample means if the population’s variance is 25.
*Sunday, June 13, 2010 at 6:30pm by Anonymous*

**statistics**

Scores on a certain test are normally distributed with a variance of 14. A researcher wishes to estimate the mean score achieved by all adults on the test. Find the sample size needed to assure with 95% confidence that the sample mean will not differ from the population mean ...
*Monday, September 13, 2010 at 7:58pm by Sarah*

**statistics**

Scores on a certain test are normally distributed with a variance of 91. A researcher wishes to estimate the mean score achieved by all adults on the test. Find the sample size needed to assure with 95.44 percent confidence that the sample mean will not differ from the ...
*Saturday, June 25, 2011 at 9:15pm by vina*

**statistic**

. For each of the following, assume that the two samples are selected from populations with equal means and calculate how much difference should be expected, on average, between the two sample means. a. Each sample has n _ 5 scores with s2 _ 38 for the first sample and s2 _ 42...
*Sunday, November 11, 2012 at 8:25pm by Sharon*

**statistics**

Determine the sample size required to estimate a population proportion to within 0.032 with 95.7% confidence, assuming that you have no knowledge of the approximate value of the sample proportion. Sample Size = B. Repeat part the previous problem, but now with the knowledge ...
*Saturday, March 28, 2009 at 10:58pm by Joey*

**statistics**

A population is normally distributed with mean 30, population SD =10, Sample size 25. What are the mean and variance of the distribution of means, respectively?
*Thursday, February 20, 2014 at 10:35pm by Keith*

**statistics **

Which of the following criteria must be met to do a one-sample test for a proportion? A. The data values in the sample must be independent. B. The parent population must be normally distributed. C. The data must come from a random sample. D. The sample size must be more than ...
*Thursday, June 27, 2013 at 6:34pm by Katie*

**statistics**

A psychologist wants to estimate the variance of employee test scores. A random sample of 18 scores had a sample standard deviation 10.4. Find a 90% confidence 2 interval for the population variance. What assumption, if any, have you made in calculating this interval estimate?
*Wednesday, November 9, 2011 at 9:21am by Janelle*

**statistics**

draw a simple random sample of 15 students from your class,and calculate sample mean and sample variance of their heights(use lottery method)
*Thursday, June 2, 2011 at 12:25pm by sireesha*

**Statistics**

Exam Grades. A statistics professor is used to having a variance in his class grades of no more than 100. He feels that his current group of students is different, and so he examines a random sample of midterm grades (listed below.) At á = 0.05, can it be concluded that the ...
*Wednesday, April 17, 2013 at 2:37pm by Gabriela*

**Statistics**

To do inferential procedures comparing two proportions, we need another variance formula (our ruler). This formula is based on what principle? A) The variance of the difference of two statistics is the difference of the variances of each statistic. B) The variance of the ...
*Friday, November 15, 2013 at 7:30pm by Katie*

**Statistics**

Use a x squared-test to test the claim about the population variance or standard deviation at the given level of significance and using the given sample statistics. Claim: ơ2 ≤ 60; α = 0.025. Sample statistics: s2 = 72.7, n = 15
*Wednesday, December 26, 2007 at 5:00pm by Brandon*

**Statistics**

Use a chi-squared test to test the claim about the population variance or standard deviation at the given level of significance and using the given sample statistics. Claim: ơ2 ≤ 60; α = 0.025. Sample statistics: s2 = 72.7, n = 15
*Thursday, December 27, 2007 at 11:37am by Brandon*

**Statistics**

Which of the following criteria must be met to do a one-proportion z- test? A. The data values in the sample must be dependent. B. The parent population must be normally distributed. C. The data must come from a random sample. D. The sample size must be more than 10% of the ...
*Tuesday, October 29, 2013 at 4:31pm by Penny*

**phoenix**

Each sample has n= 5 scores with s2 =38 for the first sample and s2 = 42 for the second. (Note: Because the two samples are the same size, the pooled variance is equal to the average of the two sample variances.)calculate how much difference should be expected, on average, ...
*Sunday, May 12, 2013 at 10:23am by diana*

**Statistics**

A study of generator related carbon monoxide deaths showed that a sample of 6 recent years had a variance of 16.8 deaths per year. Find the 99% confidence interval of the true variance
*Saturday, August 10, 2013 at 9:55am by Elise*

**statistics**

find the sample variance s2 for the following sample data. Round to the nearest hundred x: 23 17 12 35 29
*Thursday, July 22, 2010 at 3:22pm by Anonymous*

**Statistics**

Which of these statements is not true about the variance in a binomial distribution B(n, p)? __________ A. For a fixed p, the variance increases as n increases. B. For a fixed n, the variance is maximum when p = 0.5. C. The variance depends only on n. D. The variance is ...
*Saturday, March 24, 2012 at 4:00pm by Anonymous*

**statistics**

Find the sample variance s2 for the following sample data. Round your answer to the nearest hundredth. x: 23 17 12 35 29
*Friday, August 20, 2010 at 11:27am by karen*

**statistics**

Find the sample variance s2 for the following sample data. Round your answer to the nearest hundredth. x: 23 17 12 35 29
*Sunday, October 3, 2010 at 11:23pm by Stefania*

**statistics**

Find the sample variance s2 for the following sample data. Round your answer to the nearest hundredth. x: 23 17 12 35 29
*Friday, January 7, 2011 at 10:21pm by blueyeshadow*

**Intro to Statistics **

A sample has n = 9 scores and an SS = 216. What is the variance for this sample?
*Tuesday, April 19, 2011 at 1:00am by Cristina *

**Statistics**

An educator wants to estimate the proportion of school children in Boston who are living with only one parent. Since their report is to be published, they want a reasonably accurate estimate. However, since their funding is limited, they do not want to collect a larger sample ...
*Monday, September 13, 2010 at 9:04pm by Sarah*

**statistics**

A random sample of n = 30 is drawn from a population that is normally distributed, and the sample variance is s©÷ = 41.5. Use ¥á = 0.05 in testing ¥Ç₀ : ¥ò©÷ = 29.0 versus ¥Ç©û : ¥ò©÷ ¡Á 29.0
*Wednesday, August 12, 2009 at 4:05pm by Marianne*

**statistics**

Find the sample variance s2 for the following sample data. Round your answer to the nearest hundredth. x: 23 17 12 35 29 a. 84.20 b. 67.36 c. 101.00 d. 88.84 e. 126.25
*Friday, August 20, 2010 at 12:43pm by karen*

**Statistics**

In a study to estimate a population mean, i start with a sample size 10 and calculate the 95% confidence interval. Suppose i am not satisfied with the size of the confidence interval and want to reduce it by half. Give an estimate of sample size that i need.
*Monday, August 23, 2010 at 6:18pm by Zodra*

**statistics**

A random sample of 10 observations has been drawn from a normal population, and the sample variance is found to be s² = 19.5. Determine the 98% confidence interval for ó².
*Wednesday, August 12, 2009 at 10:37pm by Laura*

**statistics**

A random sample of n= 12 is drawn from a population that is normally distributed, and the sample variance is s©÷ = 19.3. Use ¥á = 0.025 in testing ¥Ç₀ : ¥ò©÷ ¡Â 9.4 versus ¥Ç©û : ¥ò©÷ > 9.4
*Wednesday, August 12, 2009 at 10:38pm by Yadira M*

**Statistics**

A credit manager has chosen a sample of size 2,164 to estimate the mean balance of credit accounts to within $0.50. A pilot study of 50 accounts had a mean of $1,219 and a variance of 100. The level of confidence of the interval is: 90% 95% 98% 99%
*Saturday, November 16, 2013 at 7:11pm by Cam*

**Statistics**

A credit manager has chosen a sample of size 2,164 to estimate the mean balance of credit accounts to within $0.50. A pilot study of 50 accounts had a mean of $1,219 and a variance of 100. The level of confidence of the interval is: 90% ? 95% ? 98% ? 99% ?
*Sunday, November 17, 2013 at 12:25pm by Em'*

**Statistics**

If the population is normally distribution then the sample must be normally distributed even for small sample size? True or False. The variance of the standard normal distribution is always equal to 1.? True or False. A continuous random variable may not be normally ...
*Friday, February 7, 2014 at 4:25pm by Jamie*

**statistics**

A researcher is testing a null hypothesis that states: H: ì = 50. A sample of 25 scores is selected and the mean is M = 55.Assuming that the sample variance is s2 = 100, compute the estimated standard error and the t statistic. Is this sample sufficient to reject the null ...
*Friday, April 15, 2011 at 7:57pm by kesha*

**Statistics**

Kind attention Psydag: A random sample of size 20 from a normal population with sample mean 42 and sample standard deviation of 6 . To test the hypothesis the population mean 44 at 5% level of significance , find the p-value and comment Clarification: The sample size is 20 ...
*Friday, January 1, 2010 at 8:37am by Mrs. Lakshmi*

**Statistics**

In an analysis of variance, if the null hypothesis is true then: - The research hypothesis is also true -You will need fewer participants for the experiment - There is less variance among the sample means than if the null hypothesis was not true - The within-group estimate of ...
*Sunday, October 11, 2009 at 10:07am by Trey*

**statistics**

given a sample size of 30, and one sample t=-2.5, what would conclude about the sample from which the mean was drawn?
*Sunday, April 24, 2011 at 6:27pm by ryee*

**Statistics**

Hi, My professor gave us the formulas for sample variance and population variance, as well as the shortcut formulas for each. However, he said that on some of the problems, we will HAVE to use the long formula, which for population variance would be: E(x-mean)^2/N Can someone ...
*Monday, October 11, 2010 at 8:47pm by Lila*

**statistics**

if a sample of a distribution of sample size 26 has a range of 56, then what would be an estimate of the sample standard deviation
*Thursday, February 14, 2013 at 1:02pm by karen*

**statistics**

IQ scores are normally distributed with a mean of 105 and a standard deviation of 18. Assume that many samples of size n are taken form a large population of people and the mean IQ score is computed for each sample. If the sample size is n=64, find the mean and standard ...
*Thursday, September 13, 2012 at 3:51pm by kimberly*

**statistics**

Determine the 90% confidence interval for a sample, taken from a normally distributed population, that has a mean of 685, a sample standard deviation of 74, and a sample size of 29
*Tuesday, November 1, 2011 at 3:13pm by Tierra*

**statistics**

Determine the 90% confidence interval for a sample, taken from a normally distributed population, that has a mean of 685, a sample standard deviation of 74, and a sample size of 29
*Tuesday, November 1, 2011 at 3:32pm by Tierra*

**statistics**

Describe a process you could use to get a simple random sample of size 20 from a class of size 40
*Monday, April 30, 2012 at 12:21am by kmccraney*

**Statistics**

All else equal will the confidence intervals for samples of size 80 be longer or shorter than those for sample of size 40?
*Monday, November 26, 2012 at 11:03pm by Emily*

**statistics**

What is the value for for a 95% confidence interval for the sample variance when n=10?
*Wednesday, August 25, 2010 at 4:21am by damian*

**statistics**

A transportation company wants to estimate the variance of the length of time goods are in transit across the country. A random sample of 20 shipments gives days and day. Give a 95% confidence interval for the variance of the transit time for all goods.
*Monday, May 17, 2010 at 5:28pm by ak*

**Quantitative Analysis**

The "standard deviation of the sample score" divided by the "square root of the sample size" is the formula for computing the ...? A. Coefficiant of Determination B. Absolute Deviation C. Variance D. Standard Error
*Wednesday, November 6, 2013 at 3:14pm by Stacie*

**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 by Ann*

**statistics**

Suppose a random sample of size 50 is selected from a population with σ = 10. Find the value of the standard error of the mean in each of the following cases (use the finite population correction factor if appropriate). a. The population size is infinite (to 2 decimals). ...
*Monday, April 14, 2014 at 5:14pm by Vanessa*

**statistics**

Suppose a random sample of size 50 is selected from a population with σ = 10. Find the value of the standard error of the mean in each of the following cases (use the finite population correction factor if appropriate). a. The population size is infinite (to 2 decimals). ...
*Tuesday, April 15, 2014 at 10:00pm by Vanessa*

**statistics**

An independent-measures study with n = 6 in each sample, produces a sample mean difference of 4 points and a pooled variance of 12. What is the value for the t statistic? a. 1 b. 2 c. 4/√2 d. 4/√8
*Saturday, November 10, 2012 at 7:05pm by Robbie*

**statistics**

An independent-measures study with n = 6 in each sample, produces a sample mean difference of 4 points and a pooled variance of 12. What is the value for the t statistic? a. 1 b. 2 c. 4/√2 d. 4/√8
*Sunday, November 11, 2012 at 9:13pm by Robbie*

**statistics**

You want to determine if your widgets from machine 1 are the same as machine 2. Machine 1 has a sample mean of 5 and a population standard deviation 1 and a sample size of 4. Machine 2 has a sample mean of 8 and a population standard deviation of 2 with a sample size of 4. ...
*Monday, October 11, 2010 at 10:39pm by Anonymous*

**Statistics**

Comcast wants to know the percent of their cable subscribers who use the internet at home. How large of a sample size should they survey to determine the proportion who use the internet within 2% and with 90% confidence interval. Please show formula when computing sample size.
*Tuesday, January 26, 2010 at 9:42am by Bryant*

**statistics**

a simple random sample will be obtained from a normally distributed population. find the minimum sample size needed to be 95% confident that the sample standard deviation (s) is within 10% of sigma. please help!
*Saturday, April 16, 2011 at 12:03pm by lucy*

**math**

A sample of size 100 is taken resulting in a standard deviation of 3. Construct a 95% confidence interval for the population variance.
*Wednesday, May 8, 2013 at 11:28pm by Jewelz*

**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 by Devika*

**statistics**

Briefly explain how increasing sample size influences each of the following. Assume that all other factors are held constant. a. The size of the z- score in a hypothesis test. b. The size of Cohen’s d. c. The power of a hypothesis test.
*Friday, March 18, 2011 at 11:48pm by Melissa Williams*

**Statistics**

Suppose X1;X2;...;X5 is a random sample from a n(0; variance) distribution. define U = X1+X2+X3+X4; V = (X2)^2+(X3)^2+(X4)^2+(X5)^2 and W = U/sqrtV. (a) Name the distribution of U/4 and V/(variance) and give the values of their parameters. (b) (i) Compute k such that kW has a ...
*Thursday, August 10, 2006 at 2:04am by ruth*

**Statistics**

A survey organization takes a simple random sample of 625 households from a city of 80,000 households. On the average, there are 2.30 persons per sample household, and the SD is 1.75. Say whether each of the following statements are True or false and explain (a) The SE for the...
*Wednesday, October 26, 2011 at 12:34pm by Joyann*

**Stats**

A simple random sample will be obtained from a normally distributed population. Find the minimum sample size needed to be 99% confident that the sample standard deviation s is within 5% of the standard deviation. Is such a sample size practical in most cases? The minimum ...
*Monday, November 28, 2011 at 9:50pm by Lindsey*

**statistics **

The sample mean to be calculated from a random sample of size n= 4 from a population consists of eight measurements (2, 6, 9, 12, 25, 29, 39, 50) . find the sampling distribution of y .(Hint : there are 70 samples of size 4 when sampling from a population of eight measurements )
*Sunday, November 14, 2010 at 1:18am by koky*

**Statistics**

Given the population: 0,0,0,0,1,1,1,1,1,1 If a sample size of 6 was taken at random with replacement, what is the probability that the sample mean is 4/6?
*Tuesday, December 14, 2010 at 3:28am by Chelsea *

**statistics**

for the population consisting of four abservations 1,3,5,7, find the dampling distribution of the sample mean for sample size n=2
*Tuesday, June 19, 2012 at 4:53pm by Anonymous*

**statistics**

The Democrat and Chronicle reported that 25% of the flights arriving at the San Diego airport during the first five months of 2001 were late (Democrat and Chronicle, July 23, 2001). Assume the population proportion is p = .25. 1. Calculate () with a sample size of 1,200 ...
*Monday, October 19, 2009 at 10:13pm by jessica knowes*

**statistics college**

find the range standard deviation and variance for following sample data 2,11,81,29,22,59,78,71,21,43,99,12,38,74,56,81
*Tuesday, May 22, 2012 at 9:47pm by melba*

**statistics**

Calculate the variance version of standard error for each sample in Exercise 10.18—for the liberals (2, 1, 3, 2) and then for the conservatives (4, 3, 3, 5, 2, 4).
*Wednesday, September 26, 2012 at 8:51pm by susan*

**Statistics **

Assume that a random sample is used to estimate a population proportion p. Find the margin of error E that corresponds to the given statistics and confidence level. 95% confidence the sample size is 2096 of which 25%are successes The margin of E= (round to four decimal places ...
*Tuesday, April 30, 2013 at 12:29am by Rob*

**statistics**

7. Determine whether it is appropriate to apply the Central Limit Theorem for Proportions: sample size 35, sample proportion 0.95. A) Yes B) No
*Wednesday, May 8, 2013 at 3:39pm by ali awan*

**statistics**

1. A random sample of size 49 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 47 minutes, and the sample standard deviation 5.89 minutes. Construct a 95% confidence interval around the ...
*Friday, July 16, 2010 at 2:53pm by Anonymous*

**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 by Devika*

**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 by Anonymous*

**statistics**

The sample mean for a recent introductory psychology test was 78, and the sample variance was 9. If a student received a score of 82, what was this student’s z-score?
*Friday, April 19, 2013 at 2:36pm by jenn*

**statistics**

Let X be the average of a sample of 16 independent normal random variables with mean 0 and variance 1. Determine c such that P (X< c) = .5
*Wednesday, March 9, 2011 at 12:07am by Anonymous*

**statistics**

2. Assume that the population proportion of adults having a college degree is 0.35. A random sample of 200 adults is to be selected to test this claim. A) What is the shape, mean, and standard deviation of the sampling distribution of the sample proportion for samples of size ...
*Tuesday, August 17, 2010 at 2:18pm by Natasha*

**stats**

Consider an infinite population with 25% of the elements having the value 1, 25% the value 2, 25% the value 3, and 25% the value 4. If X is the value of a randomly selected item, then X is a discrete random variable whose possible values are 1, 2, 3, and 4. (a) Find the ...
*Wednesday, November 5, 2008 at 8:40pm by Mischa*

**Statistics**

. A random sample is selected from a normal population with a mean of __40 and a standard deviation of __10. After a treatment is administered to the individuals in the sample, the sample mean is found to be M _ 42. a. How large a sample is necessary for this sample mean to be...
*Thursday, January 26, 2012 at 10:04pm by Sharon*

**Statistics**

A new manager, hired at a large warehouse, was told to reduce the 26% employee sick leave. The manager introduced a new incentive program for the company's employees with perfect attendance. The manager decides to test the new program to see if it's better and plans to use a ...
*Tuesday, October 29, 2013 at 4:32pm by Penny*

**statistics**

A 99% confidence interval for population variance is being formulated based on a sample of 16 observations. What are appropriate values for X^2
*Sunday, March 13, 2011 at 11:36pm by Sandy*

**statistics 251**

how do i find the standard deviation and sample variance for $7448, $4911, $9051, $6374, $4227
*Thursday, September 13, 2012 at 6:21pm by amirah*

**statistics**

A 95% confidence interval for a population mean was reported to be 23,100 to 24,900. If the sample standard deviation is 5,808.26, what sample size was used in this study?
*Sunday, June 5, 2011 at 1:25pm by Anige*

**Statistics**

A 82% confidence interval for a sampling distribution with a mean of 100, a sample standard deviation of 24 and a sample size of 36 will be based on a á= ______ and a corresponding Zá of ___
*Monday, March 5, 2012 at 3:48am by Jeff*

**Statistics**

A 82% confidence interval for a sampling distribution with a mean of 100, a sample standard deviation of 24 and a sample size of 36 will be based on a á= ______ and a corresponding Zá of ___
*Monday, March 5, 2012 at 3:49am by Jeff*

**Statistics**

A study in Orlando, Florida claimed that the mean commute time for all employees working at Disney exceeds 40 minutes. This figure is higher than what was assumed in the past. The plan is to test this claim at a level of significance = 0.05 and a sample size = 100 commuters. ...
*Wednesday, April 4, 2012 at 4:38pm by Amy*

**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 by robyn*

**statistics t test **

how to know exact t value using sample standard deviation and sample mean and sample size i think df is sample size -1 . we usually use approx value but to use exact value how to use t score table. and how we conclude whether it is two tailed test or one tailed test . (i f the...
*Sunday, July 18, 2010 at 10:03pm by Anonymous*

**Statistics**

A random sample of size 20 from a normal population will sample mean 42 and sample standard deviation of 6 . To test the hypothesis the population mean 44 at 5% level of significance , find the p-value and comment
*Thursday, December 31, 2009 at 5:07am by Mrs. Lakshmi*

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