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 being the lowest score ("no intent to purchase") and being the highest score ("full intent to purchase").
The manager finds the following information for intent-to-purchase scores for a soon-to-be-released CD: Group Sample size Sample mean Sample variance On Campus 25 65.2 94.9 By mail 25 65.3 74.3 By phone 25 70.6 103.4 By internet 25 68.2 130.1 In a store 25 63.7 102.9 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. 1. Give an estimate of this common population variance based on the variance of the sample means given. 2. Give an estimate of this common population variance by pooling the sample variances given.
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