In a study of IQ scores, if the mean score and standard deviation for the control group are 100 and 15, respectively, and the researcher has decided not to do an experiment unless an effect size of at least 1.00 can be achieved, what minimum IQ score would the treatment group need to reach?
A) 85
B) 100
C) 115
D) Depends on alpha level

Question

Quizplus · Accepted Answer

The effect size is calculated by taking the difference between the mean score of the treatment group and the control group and dividing it by the standard deviation of the control group. If we want the effect size to be at least 1.00, we can set up the equation as follows:

1.00 = (X - 100) / 15

Solving for X, we get:

X = 115

Therefore, the minimum IQ score the treatment group would need to reach is 115.

In a Study of IQ Scores, If the Mean Score