Advanced Topic: a Social Psychologist Is Designing a Study to See

Essay

Advanced topic: A social psychologist is designing a study to see whether people who see a particular film are more likely to use violence as a solution to a problem.The psychologist plans to use a scale that assesses this construct,which has a population mean of 78 and a standard deviation of 14.The psychologist expects an increase of eight points above the population mean.Fifteen participants will be enrolled in the study,and the data will be analyzed at the .05 level.
a.What is the power of the study?
b.Sketch the distributions involved.
c.Explain your answer to a person who understands hypothesis testing with means of samples,but who is not familiar with effect size or power.
d.What is the predicted effect size?
e.What are three things that might be done to increase the power of the study?