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Sample Sample Sample size Group mean variance On campus 20 73.5 96.5 By mail 20 60.5 140.3 By phone 20 62.2 78.0 By internet 20 67.4 148.3 In a store 20 63.7 43.6 Send data to calculator Send data to Excel Suppose that the five populations of scores from which these samples were drawn are approximately normally distributed and have the same mean and the same variance. Answer the following, carrying your intermediate computations to at least three decimal places and rounding your responses to at least one decimal place. |(a) Give an estimate of this common population variance by pooling the sample variances given. (b) Give an estimate of this common population variance based on the variance of the sample means given.

Sample Sample Sample size Group mean variance On campus 20 73.5 96.5 By mail 20 60.5 140.3 By phone 20 62.2 78.0 By internet 20 67.4 148.3 In a store 20 63.7 43.6 Send data to calculator Send data to Excel Suppose that the five populations of scores from which these samples were drawn are approximately normally distributed and have the same mean and the same variance. Answer the following, carrying your intermediate computations to at least three decimal places and rounding your responses to at least one decimal place. |(a) Give an estimate of this common population variance by pooling the sample variances given. (b) Give an estimate of this common population variance based on the variance of the sample means given.

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Sample Sample Sample size Group mean variance On campus 20 73.5 96.5 By mail 20 60.5 140.3 By phone 20 62.2 78.0 By internet 20 67.4 148.3 In a store 20 63.7 43.6 Send data to calculator Send data to Excel Suppose that the five populations of scores from which these samples were drawn are approximately normally distributed and have the same mean and the same variance. Answer the following, carrying your intermediate computations to at least three decimal places and rounding your responses to at least one decimal place. (a) Give an estimate of this common population variance by pooling the sample variances given. (b) Give an estimate of this common population variance based on the variance of the sample means given.
Transcribed Image Text:Sample Sample Sample size Group mean variance On campus 20 73.5 96.5 By mail 20 60.5 140.3 By phone 20 62.2 78.0 By internet 20 67.4 148.3 In a store 20 63.7 43.6 Send data to calculator Send data to Excel Suppose that the five populations of scores from which these samples were drawn are approximately normally distributed and have the same mean and the same variance. Answer the following, carrying your intermediate computations to at least three decimal places and rounding your responses to at least one decimal place. (a) Give an estimate of this common population variance by pooling the sample variances given. (b) Give an estimate of this common population variance based on the variance of the sample means given.
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