Research has shown that people are more likely to show dishonest and self-interested behaviors in darkness than in well-lit environment (Zhong, Bohns, & Gino, 2010). In one experiment, participants were given a set of 20 puzzles and were paid $0.50 for each one solved in a 5-minute period. However, the participants reported their own performance and there was no obvious method for checking their honesty. Thus, the task provided a clear opportunity to cheat and receive undeserved money. One group of participants was tested in a well-lit room and a second group was tested in a room with dimmed lighting . The reported number of solved puzzles was recorded for each individual. The following data represent results similar to those obtained in the study. Well-Lit Room Dimly-Lit Room 7 9 8 11 10 13 6 10 8 11 5 9 7 15 12 14 5 10 Use a two-tailed test with α = .01. 1. Compute the test statistic 2. Based on the calculated test statistic, would you reject the null hypothesis established in question a 3. Calculate Cohen's d to measure the size of the effect
Research has shown that people are more likely to show dishonest and self-interested behaviors in darkness than in well-lit environment (Zhong, Bohns, & Gino, 2010). In one experiment, participants were given a set of 20 puzzles and were paid $0.50 for each one solved in a 5-minute period. However, the participants reported their own performance and there was no obvious method for checking their honesty. Thus, the task provided a clear opportunity to cheat and receive undeserved money. One group of participants was tested in a well-lit room and a second group was tested in a room with dimmed lighting . The reported number of solved puzzles was recorded for each individual. The following data represent results similar to those obtained in the study.
Well-Lit Room Dimly-Lit Room
7 9
8 11
10 13
6 10
8 11
5 9
7 15
12 14
5 10
Use a two-tailed test with α = .01.
1. Compute the test statistic
2. Based on the calculated test statistic, would you reject the null hypothesis established in question a
3. Calculate Cohen's d to measure the size of the effect
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