BASIC BUSINESS STATISTICS-STUD.SOLN.MAN
BASIC BUSINESS STATISTICS-STUD.SOLN.MAN
14th Edition
ISBN: 9780134685045
Author: BERENSON
Publisher: PEARSON
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Chapter 9, Problem 51PS

The population mean waiting time to check out of a supermarket has been 4 minutes. Recently, in an effort the waiting time, the supermarket has experimented with a system in which infracted cameras use body hear and in-store software to determine how many lanes should be opened. A sample of 100 customers was selected, and their mean waiting time to check out was 3.10 minutes, with a sample standard deviation of 2.5 minutes.

a. At the 0.05 level of significance, using the critical value approach to hypothesis testing, is there evidence that the population mean waiting time to check out is less than 4 minutes?

b. At the 0.05 level of significance, using the p-value approach to hypothesis testing, is there evidence that the population mean waiting time to check out is less than 4 minutes?

c. Interpret the meaning of the p-value in this problem.

d. Compare your conclusions in (a) and (b).

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Chapter 9 Solutions

BASIC BUSINESS STATISTICS-STUD.SOLN.MAN

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