Question

INDEPENDENT SAMPLES T-TESTS

1. A researcher was interested in testing whether alertness levels differed in those who drank a cup of coffee versus those who drank an energy drink. She randomly assigned participants to one of the two conditions and then showed them a five-minute video. After the video, all participants completed a questionnaire measuring their memory for things that had been presented in the video. Higher scores = better recall. Perform an appropriate two-tailed test of the significance of the mean difference.

Coffee = 1       Energy drink = 2

Group	Recall score
1	45
1	38
1	40
1	35
2	37
2	49
2	36
2	47

Hypotheses:                        t_obs =                                               t_crit=                                                    df =     

Conclusion (reject or fail to reject):

Answer 1

ANSWER:

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