Researchers conducted an experiment to compare the effectiveness of four new weight- reducing agents to that of an existing agent. The researchers randomly divided a random sample of 50 males into five equal groups with preparation A1 assigned to the first group, A2 to the second group, and so on. They then gave a prestudy physical to each person in the experiment and told him how many pounds overweight he was. A comparison of the mean numbers of pounds overweight for the groups showed no significant differences. The researchers then began the study program, and each group took the prescribed preparation for a fixed period of time. The weight losses recorded at the end of the study period are given here:
The standard (existing) agent is labeled agent S, and the four new agents are labeled A1, A2, A3, and A4. Run an analysis of variance to determine whether there are any significant differences among the five weight- reducing agents. Use a = .05. Do any of the AOV assumptions appear to be violated? What conclusions do you reach concerning the mean weight loss achieved using the five different agents?
Answer to relevant QuestionsRefer to Exercise 9.13. Determine the significantly different pairs of means using the Tukey’s W with a = .05. In exercise In the research study concerning interviewers’ decisions: a. Describe how the subjects in this experiment could have been selected so as to satisfy the randomization requirements? b. State several research hypotheses, ...In the research study concerning the evaluation of interviewers’ decisions related to applicant handicap type, the raters were 70 undergraduate students, and the same male actors, both job applicant and interviewer, were ...Refer to Exercise 9.5. For each pair of contrasts, determine if it is orthogonal: a. Question 1 and Question 2 b. Question 1 and Question 3 c. Question 1 and Question 4 d. Question 2 and Question 3 e. Question 2 and Question ...National public opinion polls are often based on as few as 1,500 persons in a random sampling of public sentiment on issues of public interest. These surveys are often done in person because the response rate for a mailed ...
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