c. Conduct the appropriate statistical test to determine if the before treatment weight is less than the after treatment weight for clients that received CBT. Assume a=0.05. Show all calculations. [1 Mark] B. You are a registered nurse working in a weight loss clinic, and you are interested in testing three different diets to determine which is the most effective for weight loss. You conducted a clinical trial where you randomly assigned 76 clients enrolled at your clinic to one of three diets that the clients undertook for 6 weeks. You collected background data on age (years), height (cm), sex (0=females, 1=males), diet (1, 2, 3), weight at the start of the diet (pre_wt, kg), weight at the end of 6 weeks (post_wt, kg). The complete data set for the trial is in the Data folder in A2L Contents, is called Q8_DIET. Use these data to answer the questions below. a. Create a box and whisker plot showing the weight loss for each of the 3 diets. Comment on the pattern you see in weight loss across the three diets. [2 Marks] b. Conduct the appropriate statistical test to determine if there is a difference in weight loss between the three diets. Assume that weight loss is normally distributed with equal variance in the three diet groups. Let a = 0.05. Are the diets equally effective in achieving weight loss? Explain. [1 Mark] c. Based on the results from question b, run a post-hoc test (if appropriate) to determine which diet is the most effective for weight loss. Explain. [2 Marks] d. A colleague claims that age is a strong predictor of weight loss. Using your sample data, provide two statistical results, each accompanied by an appropriate interpretation, to support your response to your colleague's claim. [2 Marks]