Factorial designs have the advantage of decreasing error variance ...

[ereecah]

Factorial designs have the advantage of decreasing error variance in the data, which tends to
 
  a. increase the nonsystematic variance.
  b. decease the systematic variance.
  c. increase the statistical power.
  d. decrease the statistical power.

Question 2

In making decisions about what subjects to use in study, researchers often have to think about the __________, the entire set of cases to which one makes reference, and the __________, which is defined as a subset of the larger group.
 
  a. experimental group; control group
  b. control group; experimental group
  c. sample; population
  d. population; sample

[connor417]

Answer to Question 1

c

Answer to Question 2

d