Question

You are interested in the average cost of cell phone service. You pay $153 per month and are concerned that you are paying much more than everyone else. To assess, you collect data from 3030 other cell phone users (who each have just one line on their account) and test whether the mean of all cell phone users is different from $153 per month. After calculating the appropriate test statistic, you found that the average cost of cell phone users per month is different than $153 at the α=0.05 level. Which of the following are possible for the corresponding confidence interval? (Select all that apply.)

Answers:	a 115 to 120
	b 120 to 152
	c 155 to 175
	d 140 to 160
	e 150 to 160

Answer 1

Answers:

a 115 to 120
b 120 to 152
c 155 to 175

(These are the intervals which does not contain 153)