Chapter 9, Problem 14P

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8th Edition

Frederick J Gravetter + 1 other

ISBN: 9781133956570

Textbook Problem

The librarian at the local elementary school claims that, on average, the books in the library are more than 20 years old. To test this claim, a student takes a sample of *n* = 30 books and records the publication date for each. The sample produces an average age of *M* = 23.8 years with a variance of s^{2} = 67.5. Use this sample to conduct a one-tailed test with

To determine

**To state:** The decision of hypothesis test performed for the given question using one-tailed test.

Explanation

**Given info:**

The data has the sample size of 30 with population mean, sample mean, and variance is 20, 23.8 and 67.5.

**Calculations:**

The test hypotheses are:

Null Hypothesis is

Alternate Hypothesis is

*Degrees of Freedom:*

The critical value is obtained from the t-table for

The estimated standard error, s_{m}:

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