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algol13
3 years ago
15

Dr. Gillis has decided to use _____________ in his research to guard against both experimenter bias and participant expectations

.
a. confounding variables.
b. random selection.
c. the placebo effect.
d. the double blined design.
e. factor analysis
Social Studies
1 answer:
Leya [2.2K]3 years ago
3 0

Answer:

D

Explanation:

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