Twenty students agreed to participate in a study on colds. Ten were randomly ass
ID: 3254946 • Letter: T
Question
Twenty students agreed to participate in a study on colds. Ten were randomly assigned to receive vitamin C, and the remaining 10 received a tablet that looked and tasted like vitamin C but in fact contained only sugar and flavoring. The students did not know whether they were taking vitamin C or not, but the investigators did. The students were followed for 2 months to see who came down with a cold and who didn't. At the end of the study, 4 students taking the sugar tablet came down with a cold and only 1 student taking vitamin C came down with a cold. Which of the following applies to this study? (Select all that apply) Observational study Random sample Randomized experiment Placebo Double-blind What is the scope of inference for this study? Vitamin C is associated with fewer colds in the group of students who are similar to our sample. Vitamin C causes fewer colds in the population of all students. Vitamin C causes fewer colds in the group of students who are similar to our sample. Vitamin C is associated with fewer colds in the population of all students.Explanation / Answer
Q.14 The study has a experiment comprising randomly selected people. So option C is correct. and Here placebo is also used so option D is also correct. Here placebo means a medicine or procedure prescribed for the psychological benefit to the patient rather than for any physiological effect.
Q,15 Here in the given question option C is correct as Vitamin C is associated with fewer colds in the group of students who are similar to our sample. It is because the students are volunteer here and don't represent the entire students so it will be applicable to group of students similar to our sample. And it also has placebo and single blind so we can say that less cold is due to Vitamin C only as all other parameters are same here. So option C is correct.
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