A researcher computes the mean difference in locomotion in a sample of 12 rats before and 30 min 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 (MD ± SD) 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)
Ans: A
Education
You might also like to view...
Suicide ranks as the leading cause of death in teenagers
a. first b. second c. third d. fifth
Education
Why is responding to literature an important part of balanced literacy instruction?
What will be an ideal response?
Education
Provide a brief explanation of why applied behavior analysts measure behavior
What will be an ideal response?
Education
Explain when, if ever, factual knowledge is important to student learning
What will be an ideal response?
Education