A researcher computes the mean difference in locomotion in a sample of 12 rats before and 30 minutes after an injection of amphetamine.Rats were placed in a box with infrared beams.The number of times rats crossed the beams was used as a measure of locomotion.The mean difference in locomotion was 6.2±8.4 ( ),and this difference was significant.What is the effect size for this result using estimated Cohen's d?
A)d = 0.74 (medium effect)
B)d = 1.36 (medium effect)
C)d = 0.74 (large effect)
D)d = 1.36 (large effect)

Question

A researcher computes the mean difference in locomotion in a sample of 12 rats before and 30 minutes after an injection of amphetamine.Rats were placed in a box with infrared beams.The number of times rats crossed the beams was used as a measure of locomotion.The mean difference in locomotion was 6.2±8.4 (  ),and this difference was significant.What is the effect size for this result using estimated Cohen's d?
A)d = 0.74 (medium effect) 
B)d = 1.36 (medium effect) 
C)d = 0.74 (large effect) 
D)d = 1.36 (large effect)

Quizplus · Accepted Answer

The Answer of A researcher computes the mean difference in locomotion in a sample of 12 rats before and 30 minutes after an injection of amphetamine.Rats were placed in a box with infrared beams.The number of times rats crossed the beams was used as a measure of locomotion.The mean difference in locomotion was 6.2±8.4 (  ),and this difference was significant.What is the effect size for this result using estimated Cohen's d?
A)d = 0.74 (medium effect) 
B)d = 1.36 (medium effect) 
C)d = 0.74 (large effect) 
D)d = 1.36 (large effect)

A Researcher Computes the Mean Difference in Locomotion in a Sample