Question 16 To test the effects of a business school preparation course, 8 stude

Question

Question 16 To test the effects of a business school preparation course, 8 students took a general business test before and after the course. The results are given below. Exam Score Before Course (1) 530 690 910 700 450 820 820 630 Exam Score After Course (2) 670 770 1,000 710 550 870 770 610 Student 6 8 At the 0.05 level of significance, the conclusion for this hypothesis test would be O the business school preparation course has no impact on exam score. O It cannot be drawn from the information given O the business school preparation course does not improve exam score the business school preparation course does improve exam score.

Explanation / Answer

The statistical software output for this problem is:

Paired T hypothesis test:
D = 1 - 2 : Mean of the difference between Score before course and Score after course
H0 : D = 0
HA : D < 0
Hypothesis test results:

Since p - value is less than 0.05, we reject Ho and hence, we can conclude that test scores get improved after the course.

Hence,

Option D is correct.

Difference Mean Std. Err. DF T-Stat P-value Score before course - Score after course -50 22.990681 7 -2.1747942 0.0331

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