During the first treatment condition of a within-subjects ...

[justinmsk]

During the first treatment condition of a within-subjects experiment, the participants learn a new skill that helps improve their performance in later treatment conditions. For this study, the internal validity is threatened by ____.
 
  a. history effects
 b. instrumentation
 c. order effects
  d. regression toward the mean

Question 2

A(n) ____ is often a composite, combining different measures from different sources.
 
  a. instrument
  b. index
  c. test
  d. scale

[brittanywood]

Answer to Question 1

c

Answer to Question 2

b

[justinmsk]

Thank you!

[brittanywood]

Happy to help