_______________ refers to the assigning of test units to ...

[sheilaspns]

_______________ refers to the assigning of test units to treatment groups in such as way that the groups differ on the dependent variable before the presentation of the treatments.
 a. The main testing effect c. Selection bias
  b. Test unit mortality d. The instrumentation effect

Question 2

In most cases, the size of the population does not have a major effect on the sample size.
 
 Indicate whether the statement is true or false

[yasmin]

Answer to Question 1

C
If the test units already differ in terms of the dependent variable before the treatment is given, then selection bias has occurred.

Answer to Question 2

T

[sheilaspns]

Thank you

[yasmin]

Happy to help you