Question

You compare the happiness of people forced to smile with those of people forced to frown. Both groups have the same number of participants. The mean happiness level in the smile group is 20. The mean happiness level in the frown group is 19. The standard deviation of both groups is 20. The effect size is:_________

Answer 1

0.05

Explanation:

The Effect size = (Difference in Means) / (Standard deviation)

= (20 - 19) / 20

= 1/20

= 0.05