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?
A) 18 in the numerator, 3 in the denominator
B) 3 in the numerator, 18 in the denominator
C) 2 in the numerator, 15 in the denominator
D) 6 in the numerator, 15 in the denominator

Question

Quizplus · Accepted Answer

The degrees of freedom for the numerator is the number of groups minus one (3 - 1 = 2), and for the denominator, it is the total number of observations minus the number of groups (18 - 3 = 15).

A Large Department Store Examined a Sample of the 18