QUESTION 17 10 points smokers and is a cause of multiple dividing the nonsmokers. She then randomly selects her sample from the two groups. She is trying to determine if scleroois. Every year, for a twenty year period, she studios these subgroups, noting now diagnosed cases of multiple sclerosis. This type of study can be considered all of the following EXCEPT O A longitudinal study O A prospective study O A study to measure disease incidencn O Analytical research QUESTION 18 10 points Which one of the following is LEAST likely to involve experimental groups, control groups, independent variables and dependent variables? Analytical research Cinical trials O Double bind trials Experimental research QUESTION 19 10 points 0
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