Question: Should you purchase the lecture notes? Some college professors make bound lecture notes available to their classes in an effort to improve teaching effectiveness. Marketing Educational Review (Fall 1994) published a study of business students' opinions of lecture notes. Two groups of students were surveyed-86 students enrolled in a promotional strategy class that required the purchase of lecture notes and 35 students enrolled in a sales/retailing elective that did not offer lecture notes. At the end of the semester, students were asked to respond to the statement, "Having a copy of the lecture notes was [would be] helpful in understanding the material." Responses were measured on a 9-point semantic difference scale, where \(1=\) strongly disagree and \(9=\) strongly agree. A summary of the results is reported in the table.

1. Describe the two populations involved in the comparison.
2. Do the samples provide sufficient evidence to conclude that there is a difference in the mean responses of the two groups of students? Test using \(\alpha=.01\).
3. Construct a 99% confidence interval for \(\left(\mu_{1}-\mu_{2}\right)\). Interpret the result.
4. Would a 95% confidence interval for \(\left(\mu_{1}-\mu_{2}\right)\) be narrower or wider than the one you found in part c ? Why?

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