For Exercises perform the following steps.

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.
Use the traditional method of hypothesis testing unless otherwise specified. Assume all assumptions are valid.

A researcher wishes to see if the proportions of workers for each type of job have changed during the last 10 years. A random sample of 100 workers in Pennsylvania is selected, and the results are shown. At α= 0.05, test the claim that the proportions have not changed. Can the results be generalized to the population of the United States?

Transcribed Image Text:

10 years ago Now Total Manu- Services facturing 14 11 25 13 12 25 Government Other 17 15 8 10 25 25