Single-blind experiments help to control for ____ effects whereas ...

[jenna1]

Single-blind experiments help to control for ____ effects whereas double-blind experiments help to control for _____ effects.
 
  a. participant; experimenter and participant
  b. experimenter and participant; participant
  c. fatigue; practice
 d. practice; fatigue

Question 2

A researcher would like to select a sample of 50 people so that five different age groups are equally represented in the sample. Assuming that the researcher does not know the entire list of people in the population, which sampling technique should be used?
 
  a. quota sampling
 b. stratified random sampling
 c. proportionate stratified random sampling
  d. cluster sampling

[Harbringer]

Answer to Question 1

a

Answer to Question 2

a