Chapter 12.1, Problem 17E

For Exercises 7 through 20, assume that all variables are normally distributed, that the samples are independent, that the population variances are equal, and that the samples are simple random samples, one front each of the populations. Also, for each exercise, perform the following steps.

a. State the hypotheses and identify the claim.

b. Find the critical value.

c. Compute the test value.

d. Make the decision.

e. Summarize the results, and explain where the differences in the means are.

Use the traditional method of hypothesis testing unless otherwise specified.

17. Microwave Oven Prices A research organization tested microwave ovens. At a = 0.10, is there a significant difference in the average prices of the three types of oven?

Waits
1000	900	800
270	240	180
245	135	155
190	160	200
215	230	120
250	250	140
230	200	180
	200	140
	210	130

A computer printout for this exercise is shown. Use the P-value method and the information in this printout to test the claim. (The information in this exercise will be used in Exercise 6 of Section 12-2.)