Basic Business Statistics Student Value Edition Plus NEW MyLab Statistics  with Pearson eText -- Access Card Package (13th Edition)
Basic Business Statistics Student Value Edition Plus NEW MyLab Statistics with Pearson eText -- Access Card Package (13th Edition)
13th Edition
ISBN: 9780133873641
Author: Mark L. Berenson, David M. Levine, Kathryn A. Szabat
Publisher: PEARSON
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Chapter 7, Problem 7PS

According to a mashable post. time spent on Tumbir, a microblogging platform and social networking website, has a mean of 14 minutes per visit. Assume that time spent on Tumblr per visit is normally distributed and that the standard deviation is 4 minutes. If you select a random sample of 25 visits,

a. what is the probability that the sample mean is between 13.6 and 14.4 minutes?

b. what is the probability that the sample mean is between 13 and 14 minutes?

c. If you select a random sample of 100 visits, what is the probability that the sample mean is between 13.6 and 14.4 minutes?

d. Explain the difference in the results of (a) and (c).

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Basic Business Statistics Student Value Edition Plus NEW MyLab Statistics with Pearson eText -- Access Card Package (13th Edition)

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