Which of the following is a reason why we may NOT find a significant difference between two groups?
a. The sample size was too small.
b. The true mean difference between the groups was too small.
c. The variability between the groups was too large.
d. all of the above
Question 2
Before running an experiment, we decide to calculate power. We find that the power equals .95. What conclusion can be made?
a. We should not run the experiment.
b. 95 of the time, we will not find a significant result.
c. We should run the experiment.
d. We need 95 subjects to find a significant result.
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