After finding a significant related measures t, the experimenter ...

[jake]

After finding a significant related measures t, the experimenter might want to find out how far apart the pretest and posttest means are. If so, the experimenter would find the _____.
 
  a. obtained value of t
  b. critical value of t
  c. magnitude of effect
  d. difference between the obtained and critical values of t

Question 2

Calculating the effect size for a pretest posttest experiment gives what information to the experimenter. It tells the experimenter _____.
 
  a. the probability of a Type I error
  b. how many standard deviation units separate the means of the pretest and posttest
  c. the relative size of the variance of the pretest and posttest scores
  d. both a and c

[katheyjon]

Answer to Question 1

C
The magnitude of effect tells how far apart the group means are in standard deviation units.

Answer to Question 2

B
Effect size is a measure of the number of standard deviation units separating the means of the pretest and posttest.