Exhibit 18-1 Ten people were given two types of cereal, Brand X and Brand Y. Three people preferred Brand X, five people preferred Brand Y, and two people were undecided. We want to determine whether or not the two products are equal. The hypothesis is to be tested at the 5% level. The decision rule is not to reject the null hypothesis if _____. a. the number of " " signs is greater than or equal to 1 and less than or equal to 7 b. -1.96 < A < 1.96 c. -2.262 < t < 2.262 d. the number of " " signs is greater than or equal to 2 and less than or equal to 6