A researcher investigates whether chocolate affects mood.She recruits college students to take a mood inventory, ingest a quarter pound of chocolate, and then complete the mood inventory again.Given the confidence interval [2.34, 5.41], what decision about the hypothesis should be made?
A) Reject the null hypothesis and conclude that chocolate affected mood because 0, or no effect, does not fall within the confidence interval.
B) Reject the null hypothesis and conclude chocolate lowers mood because the confidence interval includes small numbers.
C) Fail to reject the null hypothesis because the confidence interval is positive.
D) Fail to reject the null hypothesis and conclude the effect size is small for this study.
Correct Answer:
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