In a well-designed experiment, selection bias is controlled by ...

[yoooooman]

In a well-designed experiment, selection bias is controlled by
 
  a. The existence of a control condition
  b. The independent variable
  c. Random allocation of subjects to conditions
  d. Using a within-subjects design

Question 2

The two basic elements of a true experimental design are
 
  a. a control group and random allocation of subjects to conditions
  b. a control group or a control condition and random allocation of subjects to groups
  c. random selection of subjects and random allocation of subjects to conditions
  d. random selection of subjects and each subject experiences every condition

[yasmin]

Answer to Question 1

c

Answer to Question 2

b