In a study of the effects of arousal, one group of participants is exposed to 20 minutes of
clips from a horror film. The other group sits in a quiet room for the same length of time.
Afterward, each participant receives a 100-piece puzzle to put together. The experimenter
records the amount of time it takes each participant to complete the puzzle. If this were a
double-blind study
a. the puzzles given to each group should be different.
b. the two groups should not know that they will be asked to solve puzzles.
c. both groups should be told that the study is about intelligence, not arousal.
d. the experimenter should not know which participants are in which groups.
e. the conditions during puzzle solving should be identical for each group.
d. the experimenter should not know which participants are in which groups.
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