Please show work and explain. To test the effectiveness of a business school preparation course, 9...

Please show work and explain.

To test the effectiveness of a business school preparation course, 9 students took a general business test before and after the course. The results:

Student	Exam Score Before the Course	Exam Score After the Course
1	630	770
2	690	770
3	910	1,000
4	750	710
5	450	550
6	840	860
7	820	770
8	630	610
9	580	585

(a) Use an appropriate hypothesis test, at 0.01 level of significance, to determine whether there is evidence of a difference between before and after scores of the students.

(b) What assumption is necessary to perform the hypothesis test in (a)?

(c) Construct a 99% confidence interval estimate of the mean difference in before and after scores. Interpret the interval. What is your decision based on this confidence interval estimate?

(d) Compare the results in (a) and (c).

Expert Solution

milcah answered 5 months ago

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