Image you conducted an experiment to test whether or not a horror movie can change people’s...
Image you conducted an experiment to test whether or not a horror movie can change people’s emotion states. A pre-test of negative emotion was taken before seeing the movie, and a post-test of negative emotion was taken five minutes after seeing the movie. Conduct a paired-sample T test on the following data.
| Pre-test | Post-test |
| 15 | 19 |
| 12 | 19 |
| 11 | 17 |
| 16 | 21 |
Homework Answers
Hypothesis:
H0: There is no change in negative emotions post test.
H1: There is a change in negative emotions post test.
Test-Statistics:
For paired t-test : mean of difference /S.E(mean of difference) ; S.E(mean of difference)= S.D(diff)/sqrt(n) ~t 3,0.025
From the above calculations we can see that the value of T-statistic comes out to be 8.521 (approx)
Two tailed tabulated value for T3,0.025 is equal to 3.182446305 , since the calculated T-value is greater than the tabulated T-value , We have sufficient evidence to reject our null hypothesis at 5% level of significance.
Therefore there is a significant difference in the negative emotion levels after watching the horror movie at 5% level of significance.
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