Students were randomly assigned to two different strategies of studying for an exam. One group used visual imagery, the other group was told to study their normal way.

The visual imagery group scored a 88% on the test as compared to a 76% for the control group. This difference was not significant.

a. What, if anything, can the experimenter conclude?

b. If the difference had been significant, what would you have concluded? What changes in the study would have made it easier to be sure of your conclusions?

c. "To be sure that they are studying the way they  should, why don't you have the imagery people form one study group and have the control group form another study group." Is this good advice? Why or why not?

d. "Just get a random sample of students who typically use imagery and compare them to a sample of students who don't use imagery. That will do the same thing as random assignment" Is this good advice? Why or why not?

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Solution a What if anything can the experimenter conclude Nothingnull results are inconclusive b If ... View the full answer