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A lecturer wants to see if a PowerPoint presentation will change students’ understanding of a certain

concept in Statistics. Five students were randomly selected for the study and were given a pre-test

on their understanding of the statistical concept. Then, the students viewed the PowerPoint

presentation and afterwards were given a post-test on their understanding of the statistical concept.

The data are shown in the table below:

Student

1 2 3 4 5

Pre-test score 22 18 20 20 25

Post-test score 35 18 18 41 35

Test at a 5% level of significance whether the PowerPoint presentation makes a difference in the

average understanding of the statistical concept.