required 6 years. A sample of 80 convicted car thieves was randomly selected, and the mean length of prison time was found to be 5 years and 6 months, with a population standard deviation of 1 year and 3 months. At = 0.05, test the politicians claim. Credit will be provided for the following:

1) null and alternative hypotheses

2) critical value

3) test statistic

4) decision

5) conclusion