Delmar is conducting a study. Four research assistants are helping him by admini

Question

Delmar is conducting a study. Four research assistants are helping him by administering the study. He notices that the research assistants give the study participants different instructions. He realizes that this might result in a large standard deviation. Delmar therefore creates one set of instructions that everyone will use. This should reduce the standard deviation. What effect will this have on power? Select one: a. Reducing the standard deviation will reduce power b. Reducing the standard deviation will have no effect on power c. Reducing the standard deviation will increase power

Explanation / Answer

Reducing the standard deviation in the test, decreases the probability of making the type - II error in the test. The power of the test is the complement of the type II error. Therefore reducing the standard deviation actually increases the power of the tst.

Therefore c is the correct answer here.

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