
Concept explainers
For Exercises 7 through 20, assume that all variables are
a. State the hypotheses and identify the claim.
b. Find the critical value.
c. Compute the test value.
d. Make the decision.
e. Summarize the results, and explain where the differences in the
Use the traditional method of hypothesis testing unless otherwise specified.
13. Expenditures per Pupil The per-pupil costs (in thousands of dollars) for cyber charter school tuition for school districts in three areas of southwestern Pennsylvania are shown. At a = 0.05, is there a difference in the means? If so, give a possible reason for the difference. (The information in this exercise will be used in Exercise 5 of Section 12-2.)
Area I | Area II | Area III |
6.2 | 7.5 | 5.8 |
9.3 | 8.2 | 6.4 |
6.8 | 8.5 | 5.6 |
6.1 | 8.2 | 7.1 |
6.7 | 7.0 | 3.0 |
6.9 | 9.3 | 3.5 |
Source: Tribune-Review.

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Chapter 12 Solutions
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