Chocolate Chip Cookies Suppose the sample mean of the numbers of chocolate chips in 40 Chips Ahoy reduced fat cookies is known. The sample mean is x =

19.6 chocolate chips and the sample standard deviation is 3.8 chocolate chips. Use a 0.05 significance level to test the claim that Chips Ahoy reduced-fat cookies have less fat because they have a mean number of chocolate chips that is less than the mean of 24 for regular Chips Ahoy cookies. See the accompanying display that results from this hypothesis test.