A group of 100 students were randomly assigned to receive vitamin C (50 students) or a placebo (50 students). The groups were followed for 2 weeks and the proportions with colds were compared.

A. Independent samples
B. Paired samples

This experiment is comparing the results between two independent samples. Paired samples consist of data for which each point in one sample would be paired to a specific data point in another sample. In the present study, there are no naturally occurring pairs since only the proportions, for the whole sample, of students with colds were compared. Therefore, the answer is:

A. Independent samples .

A group of 100 students were randomly assigned to receive vitamin C (50 students) or a placebo (50 students). The groups were followed for 2 weeks and the proportions with colds were compared. A. Independent samples B. Paired samples

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A group of 100 students were randomly assigned to receive vitamin C (50 students) or a placebo (50 students). The groups were followed for 2 weeks and the proportions with colds were compared.

A. Independent samples
B. Paired samples