dh.png 100% X . . . Q2: Placebo effect of exercise Imagine that Crum and Langer were able to repeat their study from Q1 above, but this time adding a third group of workers that was given only half of the information compared to the original treatment group. Now the experiment has three groups: the Full treatment group, the Half treatment group and the Control group. They wish to apply a statistical method to test whether the level of information provided is associated with a change in the workers' average BMI four weeks later. a. What is the most appropriate statistical method to answer this question, and why? Provide as many details as possible to justify your choice, using appropriate statistical terminology. b. Write a description of an appropriate null hypothesis in words for the test you described in part 2a above c. Next, we examine a different exercise placebo experiment published by Desharnais et al. (1993). The following graph shows average self-esteem reported by a treatment group (EXPERIMand a control group (CONTROL) against number of weeks since the start of the experiment. Provide one sentence to describe in words what this graph shows. 36 7 35 EXPERIM + CONTROL 34 SELF-ESTEEM 32 31- WK- 1 WK-4 WK-7 WK-10 WEEKS Fig. 1. Self-esteem scores for subjects in the experimental and control conditions at the ist, 4th, 7th, and 10th weeks of the exercise program. d. By what name is this type of plot referred to in the lecture notes and textbook? e. What does the above plot tell us about the relationship between these variables? What are the implications for the statistical test in part 2a above, and why? 9. C ENG 9:09 PM Partly cloudy US 2022-11-09