In a Study to Test the Effects of Science Fiction

question 52

Essay

In a study to test the effects of science fiction movies on people's belief in the supernatural,seven people completed a measure of belief in the supernatural before and after watching a popular science fiction movie.Participants' scores are listed below with high scores indicating higher levels of belief.Using the .01 significance level,carry out a t test for dependent means to test the experimenter's assumption that the participants' belief in the supernatural would change after watching the movie. a.Use the five steps of hypothesis testing.
b.Sketch the distributions involved.
c.Figure the effect size and find the approximate power of this study.
d.Explain the logic of what you did to a person who is familiar with hypothesis testing with a known population variance and a single sample,including understanding decision errors,effect size and power,but who knows nothing about t tests of any kind (for example,you do not need to describe the steps or logic of hypothesis testing).Be sure you explain how this problem differs from a problem with a known population variance and a single sample.Your answer should consist mainly of a thorough explanation of the characteristics of the comparison distribution and all the figuring you did to determine those characteristics.

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Definitions:

Birth Defect

A physical or biochemical abnormality that is present at birth and that may cause physical or mental disability.

Embryonic Period

A critical phase in development that spans from conception to the eighth week, where major organs and structures begin to form in an embryo.

Prenatal Development

The process of growth and development within the womb from conception to birth.

Uterus

A female reproductive organ where fetal development occurs during pregnancy.