Perform the test comparing the models relevant to this question.

You are planning a large-scale replication of a study of a treatment for problem drinkers that previously has been shown in a different location to be significantly more effective than a control condition. You begin by conducting a pilot study with five subjects per group. Your results for this pilot study are shown below, where the dependent variable is the estimated number of days of problem drinking per year after treatment. a. The previous researchers had found means of 12 and 174 on this dependent variable for their implementations of the treatment and control conditions, respectively. Conduct a test of whether your pilot results replicate this previous research by comparing a model that allows for different population means in the two conditions with one that assumes means of 12 and 174. b. Alternatively, you could have simply asked the question of whether the difference between your means was significantly different from the 162-point difference obtained by the previous investigators. Perform the test comparing the models relevant to this question. c. What do you conclude on the basis of the results of the tests in parts a and b?


 

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