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 means are.
Use the traditional method of hypothesis testing unless otherwise specified.
14. Cell Phone Bills The average local cell phone monthly bill is $50.07. A random sample of monthly bills from three different providers is listed below. At a = 0.05, is there a difference in
Provider X | Provider Y | Provider Z |
48.20 | 105.02 | 59.27 |
60.59 | 85.73 | 65.25 |
72.50 | 61.95 | 70.27 |
55.62 | 75.69 | 42.19 |
89.47 | 82.11 | 52.34 |
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Check out a sample textbook solutionChapter 12 Solutions
Elementary Statistics: A Step By Step Approach
- Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw Hill