The fact that research participants may become fatigued or bored ...

[HudsonKB16]

The fact that research participants may become fatigued or bored in the course of an experiment introduces a confound called:
 
  a. maturation.
  b. history.
  c. mortality.
  d. statistical regression.

Question 2

The confound that refers to events other than the independent variable, that occur during an experiment is called:
 
  a. maturation.
  b. instrumentation.
  c. history.
  d. selection.

[gasdhashg]

Answer to Question 1

A

Answer to Question 2

C

[HudsonKB16]

Thanks for the timely response, appreciate it

[ghepp]

Excellent