Twelve customers receiving free e-mail and 12 customers receiving free basic TV were surveyed. Those with the free e-mail service were -0.3333 points less satisfied. The value of σM1 - M2 was 0.66050.
a. What is the best point estimate for the difference in satisfaction for the next customers surveyed from each package?
b. In constructing a confidence interval for the expected difference in satisfaction, what difference score will fall in the center of the interval?
c. We can be 95% confident that the true difference in satisfaction between the two packages is between which two values?
For Information: Exercise 8 in Module 20 addressed difference in satisfaction between two different Internet packages.