n one study subjects were randomly assigned to receive either 500 milligrams of vitamin C daily or a placebo, and the number of colds they came down with during a winter season was noted. In the second study people responded to a questionnaire asking about the average number of hours they sleep per night and the number of colds they came down with during a winter season. a. The first study was an observational study, while the second was a controlled experiment. b. The first study was a controlled experiment, while the second was an observational study. c. Both studies were controlled experiments. d. Both studies were observational studies.
n one study subjects were randomly assigned to receive either 500 milligrams of vitamin C daily or a placebo, and the number of colds they came down with during a winter season was noted. In the second study people responded to a questionnaire asking about the average number of hours they sleep per night and the number of colds they came down with during a winter season. a. The first study was an observational study, while the second was a controlled experiment. b. The first study was a controlled experiment, while the second was an observational study. c. Both studies were controlled experiments. d. Both studies were observational studies.
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Question
In one study subjects were randomly assigned to receive either 500 milligrams of vitamin C daily or a placebo, and the number of colds they came down with during a winter season was noted. In the second study people responded to a questionnaire asking about the average number of hours they sleep per night and the number of colds they came down with during a winter season.
| a. |
The first study was an observational study, while the second was a controlled experiment.
|
|
| b. |
The first study was a controlled experiment, while the second was an observational study.
|
|
| c. |
Both studies were controlled experiments.
|
|
| d. |
Both studies were observational studies.
|
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