A local school reports that the average GPA in the entire school is a mean score of

Question:

A local school reports that the average GPA in the entire school is a mean score of 2.66, with a standard deviation of 0.40. The school announces that it will be introducing a new program designed to improve GPA scores at the school. What is the effect size (d) for this program if it is expected to improve GPA by:

(a) 0.05 points?

(b) 0.10 points?