Twenty students agreed to participate in a study on colds. Ten were randomly ass

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.

[3 pts] Select all of the following which applies to the study.

A) Placebo

B) Random sample

C) Observation study

D) Double-blind

E) Random assignment

F) Randomized experiment

What is the appropriate scope of inference for this study?

A) Vitamin C causes fewer colds in the group of students who are similar to our sample.

B) Vitamin C causes fewer colds in the population of all students.

C) Vitamin C is associated with fewer colds in the group of students who are similar to our sample.

D) Vitamin C is associated with fewer colds in the population of all students.

Explanation / Answer

The things which are applied to this study are:

A) Placebo

B) Random sample

E) Random assignment

F) Randomized experiment

Scope of Inference:

Vitamin C is associated with fewer colds in the population of all students.

Option D is correct.

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