Concept explainers
For Exercises 7 through 23, perform each of the following steps.
a. State the hypotheses and identify the claim.
b. Find the critical value(s).
c. Find the test value.
d. Make the decision.
e. Summarize the results.
Use the traditional method of hypothesis testing unless otherwise specified.
22. Number of Jobs The U.S. Bureau of Labor and Statistics reported that a person between the ages of 18 and 34 has had an average of 9.2 jobs. To see if this average is correct, a researcher selected a random sample of 8 workers between the ages of 18 and 34 and asked how many different places they had worked. The results were as follows:
At α = 0.05, can it be concluded that the mean is 9.2? Use the P-value method. Give one reason why the respondents might not have given the exact number of jobs that they have worked.
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Elementary Statistics: A Step By Step Approach
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- Solve the problems by following the steps and procedures in hypothesis testing. PRACTICE QUESTIONarrow_forwardThe P-value for a hypothesis test is P = 0.034. Do you reject or fail to reject H 0 when the level of significance is α = 0.01?arrow_forwardAt one school, the average amount of time that tenth-graders spend watching television each week is 15.5 hours. The principal introduces a campaign to encourage the students to watch less television. One year later, the principal wants to perform a hypothesis test to determine whether the average amount of time spent watching television per week has changedarrow_forward
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