Is there a difference in the satisfaction rating of traditional cellphone providers who bill for service at the end of a month often under a contract and prepaid cellphone service providers who bill in advance without a contract? The file CellphoneProviders contains the satisfaction rating for 10 traditional cellphone providers and 13 prepaid cellphone service providers.
a. Is there evidence of a difference in the median satisfaction rating for traditional and prepaid providers?
b. What assumptions must you make in (a)?
c. Compare the results (a) with those of Problem 10.9 (a) on page 360.
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