Andrew wishes to test the hypothesis that people give more freely to charities when the weather is pleasant. To test this hypothesis, Andrew is likely to make use of a. double-blind controls. b....

Andrew wishes to test the hypothesis that people give more freely to charities when the weather is pleasant. To test this hypothesis, Andrew is likely to make use of

a. double-blind controls.

b. expectancy effects.

c. laboratory observation.

d. archival data.