The average response time to a bank robbery is about 9 minutes with a standard deviation of 4.2 minute. A local community wants to improve on this time, so they implement advanced training seminars. They find that the new response time for a sample of 36 tests is M = 8 minutes. Test whether this advanced training seminar decreased the response time at a .05 level of significance (one-tailed).

(a) State the null and alternative hypotheses using statistical notation

(b) Provide the criterion and critical values

(c) Compute the test statistic

(d) Make a decision - accept or reject the null hypothesis and why

(e) Compute Cohen's d and interpret it.