Ackerman and Goldsmith (2011) found that students who studied text from printed hardcopy had better test scores than students who studied from text presented on a screen. In a related study, a professor noticed that sev-eral students in a large class had purchased the e-book version of the course textbook. For the final exam, the overall average for the entire class was = 81.7 but the n = 9 students who used e-books had a mean of M = 77.2 with a standard deviation of s = 5.7.

A)Construct the 90% confidence interval to estimate the mean exam score if the entire population used e-books.

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