A consumer report company obtained records of the monthly cell phone bills of students at Bush Campus and takes a random sample of 10 cell phone bills of Bush campus residents from provider AG&G and another of 8 cell phones bills from provider CT&T The summary data is given below. We want to compare the mean cost between CT&T and AG&G phones. Are they the same? It is assumed that the populations are normal, and the variances are approximately equal and = 0.10.

-Which hypothesis test is appropriate?

-What kind of alternative should be used?

-Perform the test and discuss the conclusion.

Sample	Mean	SD	Sample Size
AG&G	$33	7	10
CT&T	$40	11	8

Refer above.

-Does the data suggest that the standard deviation of the AG&G bills is smaller than that for CT&T bills?

-Carry out a test at significance level =0.01