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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.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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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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