An experimenter varied the type of background music during an exam to determine whether this intervention would affect exam scores. Is there a difference in the means of the exams with alpha equal to...

An experimenter varied the type of background music during an exam to determine whether this intervention would affect exam scores. Is there a difference in the means of the exams with alpha equal to .05?

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What is the critical value?

What is your decision? (choose the appropriateletterfrom the options below)

1. Fail to reject the null because your results are not significant :(


2. Reject the null because our results are not significant :(


3. Fail to reject the null because your results are statistically significant!


4. Reject the null because your results are statistically significant!

What is the effect size?