We are testing people to see if the rate of use of seat belts has decreased from a previous value of 80%

We are testing people to see if the rate of use of seat belts has decreased from a previous value of 80%. Suppose that in our random sample of 100 people, we see that 72 have the seat belt fastened. The researcher is interested in a =0.1 level test.
Step 1. State the name and alternate hypotheses.
Step 2. Write down the appropriate test statistics (formula) and the rejection region of your test (report z critical (s)
Step 3. Compute the value of the test statistics. (z observed).
Step4. State your conclusion ( in one sentence, state whether or not the test rejects the null hypothesis and in another sentence apply the results to the problem).
Step5. Compute the p-value for this test. State your decision

  • September 4, 2017
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