A group of 268 overweight people signed up for a weight lossprogram. Participants were asked to choose whether they wanted togo on a vegetarian diet or follow a traditional low-calorie dietthat included some meat. 153 people chose the vegetarian diet, andthe rest chose to be in the control group and continue to eat meat.There was a greater weight loss in the vegetarian group.
- What is the sample size of each group? What percentage ofpeople was in the vegetarian group? What percentage was in the meatgroup? (Round to the nearest percent.)
- What are the variables in this study? Remember that variablesare used to record the characteristics of individual people orthings. The description above does not necessarily name all thevariables - you have to make an educated guess about whatcharacteristics were measured and recorded in order to conduct thisstudy. For each variable, indicate whether it is acategorical variable or a numerical variable, andexplain why.
- What confounding variables might account for the increasedweight loss in the vegetarian group? Explain.
- an observational or a controlled study?
- should I design the study that is more likely to remove theeffect of confounding variables
