Question: In the book Business research Methods, Donald Coope and William Emory (1995) discuss a manager who wishes to compare the effectiveness of two different methods of training sales people. Their sample findings are as follows:

Group A Group B

Average weekly sales $1500 $1300

Standard Deviation $225 $251

Sample size 22 22

a. The above samples are independent random samples. Set up the null and

Alternative hypothesis to test that group A has higher sales than group B.

b. Test the hypothesis in a using alphas of .10, .05, .01, and .001. How much

evidence is there that A is greater? ( Hint: Use Minitab as in 1 above. Enter you summary data in the summary categories under two sample t).

c. Calculate a 95% confidence interval for this difference. ( Hint: again use

your output from Minitab.)