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At LLD Records, some of the market research of college students is done during promotions on college campuses, while other market research of college students is done through anonymous mail, phone, internet, and record store questionnaires. In all cases, the company solicits an "intent-to-purchase" score from the student, with 0 being the lowest score ("no intent to purchase") and 100 being the highest score ("full intent to purchase"). The manager finds the following information for 100 intent-to-purchase scores for a soon-to-be-released CD: Sample Sample Sample size Group mean variance On campus 20 63.3 100.2 By mail 20 59.1 181.6 By phone 20 62.5 119.9 By internet 20 65.6 64.4 In a store 20 64.8 137.2 Send data to calculator uppose that the five populations of scores from which these samples were drawn are approximately normally distributed and have the ame mean and the same variance. nswer the following, carrying your intermediate computations to at least three decimal places and rounding your responses to at least ne 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.

At LLD Records, some of the market research of college students is done during promotions on college campuses, while other market research of college students is done through anonymous mail, phone, internet, and record store questionnaires. In all cases, the company solicits an "intent-to-purchase" score from the student, with 0 being the lowest score ("no intent to purchase") and 100 being the highest score ("full intent to purchase"). The manager finds the following information for 100 intent-to-purchase scores for a soon-to-be-released CD: Sample Sample Sample size Group mean variance On campus 20 63.3 100.2 By mail 20 59.1 181.6 By phone 20 62.5 119.9 By internet 20 65.6 64.4 In a store 20 64.8 137.2 Send data to calculator uppose that the five populations of scores from which these samples were drawn are approximately normally distributed and have the ame mean and the same variance. nswer the following, carrying your intermediate computations to at least three decimal places and rounding your responses to at least ne 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
Section10.6: Summarizing Categorical Data
Problem 10CYU
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At LLD Records, some of the market research of college students is done during promotions on college campuses, while other market research of college students is done through anonymous mail, phone, internet, and record store questionnaires. In all cases, the company solicits an "intent-to-purchase" score from the student, with 0 being the lowest score ("no intent to purchase") and 100 being the highest score ("full intent to purchase"). The manager finds the following information for 100 intent-to-purchase scores for a soon-to-be-released CD: Sample Sample Sample Group size mean variance On campus 20 63.3 100.2 By mail 20 59.1 181.6 By phone 20 62.5 119.9 By internet 20 65.6 64.4 In a store 20 64.8 137.2 Send data to calculator 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:At LLD Records, some of the market research of college students is done during promotions on college campuses, while other market research of college students is done through anonymous mail, phone, internet, and record store questionnaires. In all cases, the company solicits an "intent-to-purchase" score from the student, with 0 being the lowest score ("no intent to purchase") and 100 being the highest score ("full intent to purchase"). The manager finds the following information for 100 intent-to-purchase scores for a soon-to-be-released CD: Sample Sample Sample Group size mean variance On campus 20 63.3 100.2 By mail 20 59.1 181.6 By phone 20 62.5 119.9 By internet 20 65.6 64.4 In a store 20 64.8 137.2 Send data to calculator 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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