Hypelinked data: To test the effectiveness of a business school preparation cour

Question

Hypelinked data:

To test the effectiveness of a business school preparation course, 28 students took a general business test before (Test A) and after the course (Test B). A better score from test B indicates that the student improved his/her preparation for business study by taking the course. The test scores are reported in the hyperlinked data file Which statement of the following is NOT correct? At the 0.05 level of significance, we reject the null hypothesis that the mean scores from the two exams are not signficantly different. The 99% confidence interval of the mean difference includes 0. At the 0.10 level of significance, there is sufficient evidence that the business school preparation course does improve exam score. To test whether any improvement occured, we could use paired t test.

Explanation / Answer

The statistical software output for 99% confidence interval is:

Paired T confidence interval:
D = 1 - 2 : Mean of the difference between Test A and Test B
99% confidence interval results:

Hence,

We can see that this interval doesn't include 0.

Therefore,

Option B is correct.

Difference Mean Std. Err. DF L. Limit U. Limit Test A - Test B -3.9642857 1.3651774 27 -7.7467595 -0.18181192

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