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37.In a(n) _____________, the environments of the subjects are controlled or manipulated by the researcher. a. census b. experiment c. observational study d. sample survey
37.In a(n) _____________, the environments of the subjects are controlled or manipulated by the researcher.
| a. | census | |
| b. | experiment | |
| c. | observational study | |
| d. | sample survey |
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Understanding Public Opinion Polls
Authors: Jelke Bethlehem
1st Edition
1498769756, 9781498769754
