Chapter 9.1, Problem 19E

In Exercises 9.15–9.22, hypothesis tests are proposed. For each hypothesis test,

1. a.      determine the null hypothesis.
2. b.      determine the alternative hypothesis.
3. c.       classify the hypothesis test as two tailed, left tailed, or right tailed.

9.19 Serving Time. According to the Bureau of Crime Statistics and Research of Australia, as reported on Lawlink, the mean length of imprisonment for motor-vehicle-theft offenders in Australia is 16.7 months. You want to perform a hypothesis test to decide whether the mean length of imprisonment for motor-vehicle-theft offenders in Sydney differs from the national mean in Australia.