A large department store examined a sample of the 18 credit card sales and recor

Question

A large department store examined a sample of the 18 credit card sales and recorded the amounts charged for each of three types of credit cards: MasterCard, Visa, and Discover. Six MasterCard sales, seven Visa, and five Discover sales were recorded. The store used an ANOVA to test if the mean sales for each credit card were equal. What are the degrees of freedom for the F statistic?

Select one:

A. 18 in the numerator, 3 in the denominator

B. 6 in the numerator, 15 in the denominator

C. 3 in the numerator, 18 in the denominator

D. 2 in the numerator, 15 in the denominator

Explanation / Answer

Now there are 3 credit cards and n=18

Hence degrees of freedom for the F statistic (k-1, n-k)=(2,15)

Hence answer is

D. 2 in the numerator, 15 in the denominator

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