A marketing manager is interested in the number of trips per month that people take to a
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A marketing manager is interested in the number of trips per month that people take to a nearby shopping center. Denote the number of trips per month by X.
The manager feels that the variance of X is 16 for women and 9 for men. He decides to stratify by sex, and there are 100 males and 200 females in the population of interest. He takes a random sample of 10 males and another random sample of 15 females and gets the following results:
(a) Estimate the mean of each of the two strata and the mean of the entire population by pooling the samples.
(b) Determine the variance of the pooled samples.
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Related Book For 
Statistics For Business And Financial Economics
ISBN: 9781461458975
3rd Edition
Authors: Cheng Few Lee , John C Lee , Alice C Lee
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