study was done to compare the effectiveness of distance learning with traditional classroom instruction. Twelve students took a business administration course online, while 14 students took it in a classroom. The final exam scores were as follows. It is reasonable to assume that the samples come from populations that are approximately normal.

a. Construct a 95% confidence interval for the difference between the mean scores for the two types of instruction.

b. An educator claims that both methods of instruction are equally effective. Does the confidence interval contradict this claim?

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Online 66 75 85 64 88 77 74 91 72 69 77 83 Classroom 80 83 64 81 75 80 86 81 91 64 99 85 74 77