A researcher selected a random sample of 100 students at a u…
A researcher selected a random sample of 100 students at a university. He asked each student the following two questions: (1) Do you regularly take vitamins? (2) How many colds have you had in the last six months? Based on the answers collected, the researcher identified two groups: The group of students who take vitamins, and the group of students who don’t take vitamins. Then, the researcher compared the total number of colds for each group. What type of study is this, and why?
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