Applied Statistics in Business and Economics
Applied Statistics in Business and Economics
5th Edition
ISBN: 9780077837303
Author: David Doane, Lori Seward Senior Instructor of Operations Management
Publisher: McGraw-Hill Education
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Chapter 15.5, Problem 15SE

Exam scores of 40 students in a statistics class are shown. (a) Estimate the mean and standard deviation from the sample. (b) Assuming that the data are from a normal distribution, define bins by using method 3 (equal expected frequencies). Use 8 bins. (c) Set up an Excel worksheet for your chi-square calculations, with a column showing the expected frequency for each bin (they must add to 40). (d) Tabulate the observed frequency for each bin and record it in the next column. (e) Carry out the chi-square test, using α = .05. Can you reject the hypothesis that the exam scores came from a normal population?

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