Tuna III In Exercise 10.26 and dataset EX1026, you conducted a test to detect a diff...

Tuna III In Exercise 10.26 and dataset EX1026, you conducted a test to detect a difference in the average prices of light tuna in water versus light tuna in oil.

a. What assumption had to be made concerning the population variances so that the test would be valid?

b. Do the data present sufficient evidence to indicate that the variances violate the assumption in part a? Test using α = .05.

Reference:

Tuna, again In Exercise 10.6 we presented data on the estimated average price for a 6-ounce can or a 7.06-ounce pouch of tuna, based on prices paid nationally in supermarkets. A portion of the data is reproduced in the table below. Use the MINITAB printout to answer the questions.

a. Do the data in the table present sufficient evidence to indicate a difference in the average prices of light tuna in water versus oil? Test using α = .05.

b. What is the p-value for the test?

c. The MINITAB analysis uses the pooled estimate of . Is the assumption of equal variances reasonable? Why or why not?