A local school reports that its average GPA is 2.66 +/- 0.40 (mu +/- sigma).  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: .05 points? .10 points? .40 points?

MATLAB: An Introduction with Applications
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  1. A local school reports that its average GPA is 2.66 +/- 0.40 (mu +/- sigma).  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:
  1. .05 points?
  2. .10 points?
  3. .40 points?
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