For students at a large, state university, consider two groups. group 1: students who purchased their textbooks for the current semester at the campus bookstore and group 2: students who purchased their textbooks for the current semester online. a 99% confidence interval for −, the difference in population mean amounts spent on textbooks, is 30 to 60 dollars. the confidence interval provides no strong evidence to support or refute the claim that, on average, students who purchased their books at the campus bookstore spent dollars more than those who purchased their books online. a. more than 25 b. less than 65 c. at least 20 d. more than 50 e. at most 70 the confidence interval would tend to support the claim that, on average, students who purchased their books at the campus bookstore spent dollars more than those who purchased their books online. a. less than 20 b. at least 32 c. at most 40 d. more than 65 e. at least 25