A study of a new reading training program achieved, with 100 ...

[Melani1276]

A study of a new reading training program achieved, with 100 subjects, the following results: experimental group mean = 30.25 (SD = 3.28) and control group mean = 25.14 (SD = 4.75). However, a second study with 541 subjects found experimental group mean = 28.81 (SD = 2.56) and control group mean = 26.62 (SD 2.01).
 
  a. The first study had a higher effect size.
  b. The second study had a higher effect size.
  c. Both studies had similar effect sizes.
  d. None of these are true.

Question 2

The z-scores for X and Y variables are exactly the same except they have opposite signs. The coefficient of determination is
 
  a. 0.00.
  b. -1.00.
  c. +1.00.
  d. not possible to compute with this information.

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Answer to Question 1

C

Answer to Question 2

C