Do you prefer taking tests on paper or online?

A college instructor gave identical tests to two randomly sampled groups of 35 students. One group took the test on paper and the other took it online. Following are the test scores.

a. Construct a 95% confidence interval for the difference in mean scores between paper and online tests.

b. The instructor claims that the mean scores are the same for both the paper and the online versions of the test. Does the confidence interval contradict this claim?

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