A Wall-Mart department store examined a sample of the 20 credit sales, and recorded the amounts charged for each of four types of credit cards as follows: 4 for American Express, 5 for Master Card, 6 for Visa , and 5 for Discover. What are the degrees of freedom for the F statistic? O 15 for the numerator, 4 for the denominator O 3 for the numerator, 16 for the denominator O 2 for the numerator, 17 for the denominator O 16 for the numerator, 4 for the denominator

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