# Ackerman and Goldsmith (2011) found that students who studied text from printed hardcopy had better test scores

## Question:

For the final exam, the overall average for the entire class was µ = 81.7, but the n = 9 students who used e-books had a mean of µ = 77.2 with a standard deviation of σ = 5.7.

a. Is the sample sufficient to conclude that scores for students using e-books were significantly different from scores for the regular class? Use a two-tailed test with a = .05.

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

c. Write a sentence demonstrating how the results from the hypothesis test and the confidence interval would appear in a research report.

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**Related Book For**

## Essentials Of Statistics For The Behavioral Sciences

**ISBN:** 9781133956570

8th Edition

**Authors:** Frederick J Gravetter, Larry B. Wallnau