5. Complete the following parts using a data set about popular diets (PopularDiets.csv). The data dictionary for the data set is found in the le DietDataDescription.pdf. The journal article that explains the study with results is in the le JournalArticleForDietStudy_joc402l4. You will need to browse the journal article to answer parts a) and c). a) b) C) d) s) Was this study an observational study or an experiment? Briey explain. What participants were sampled for this study? What do you believe to be the population of interest? Do you think the results can be generalized to the population of interest or some other population? Explain. Read in the data. Set variables to factors as needed. [Code for this is provided in the template so there is nothing you need to do.] How many observations are in the data set? How many of the subjects completed the study? Explore the weight loss variable. Present summary statistics and two different graphs (your choice) that give you a complete picture of the sample distribution for this variable. Synthesize your overall ndings the describe the sample distribution of weight loss by combining the information you get from the summary statistics and graphs. 'What numeric statistics do you think are best to use to summarize the location and variability of weight loss? Explain. Explore how weight loss varies by type of diet. [I-Iint: use comparative box plots or faceted histograms by diet type]. Make a qualitative assessment, based on the graph, regarding differences in the distribution of weight loss by diet type. An article* reported on a study in which l volunteers were randomly assigned to one of four popular diet plans: Atkins, Urnish, Weight Watchers, and Zone (40 subjects per diet). These subjects were recruited through newspaper and television advertisements in the greater Boston area; all were overweight or obese with body mass index values between 2? and 42. Among the variables recorded were: which diet the subject was assigned to whether or not the subject completed the twelvemonth study the subject's initial weight (in kilograms) the degree to which the subject adhered to the assigned diet, taken as the average of 12 monthly ratings, each on a llL scale (with 1 indicating complete nonadherence and 16 indicating full adherence) the subject's weight after 12 months (in kilograms) the subject's weight loss after twelve months (in kilograms, with a negative value indicating weight gain)