The following data show the means for four treatment conditions ...

[notis]

The following data show the means for four treatment conditions as well as the overall means for the columns and the rows. For these data, what numbers are compared to assess the main effect of factor A? A1 A2 B1 M = 20 M = 60 M = 40 B2 M = 30 M = 70 M = 50 M = 25 M = 65
 
  a. 30; 70
  b. 20; 30
  c. 40; 50
  d. 25; 65

Question 2

When the change from pretest to posttest is due not to your program but rather to a change in the way you measured the outcome, there is a(n) _______________ threat to internal validity.
 
  Fill in the blank(s) with correct word

[Harbringer]

Answer to Question 1

d

Answer to Question 2

instrumentation

[notis]

Thank you

[Harbringer]

No problem