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.
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter4: Equations Of Linear Functions
Section4.5: Correlation And Causation
Problem 11PPS
Related questions
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.
|
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
This is a popular solution!
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
Recommended textbooks for you
Glencoe Algebra 1, Student Edition, 9780079039897…
Algebra
ISBN:
9780079039897
Author:
Carter
Publisher:
McGraw Hill
College Algebra (MindTap Course List)
Algebra
ISBN:
9781305652231
Author:
R. David Gustafson, Jeff Hughes
Publisher:
Cengage Learning
Glencoe Algebra 1, Student Edition, 9780079039897…
Algebra
ISBN:
9780079039897
Author:
Carter
Publisher:
McGraw Hill
College Algebra (MindTap Course List)
Algebra
ISBN:
9781305652231
Author:
R. David Gustafson, Jeff Hughes
Publisher:
Cengage Learning