There are 3 major threats to the validity of pre-experimental ...

[roselinechinyere27m]

There are 3 major threats to the validity of pre-experimental designs. They are _____.
 
  a. history, maturation, and testing
  b. selection, history, and generalization
  c. generalization, selection, and mortality
  d. selection, mortality and the selection by mortality interaction

Question 2

Naturalistic observation is rarely used by scientists because it does not make use of the scientific method.
 
  Indicate whether the statement is true or false

[ttt030911]

Answer to Question 1

D
Selection, mortality, and the interaction between them present challenges to the validity of pre-experimental designs.

Answer to Question 2

F

[roselinechinyere27m]

Thank you

[ttt030911]

No problem