Internal validity is not concerned with

Internal validity is not concerned with
 
  a. maturation
  b. generalization.
  c. experimental mortality.
  d. statistical regression.
  e. interaction of pretest and treatment.

Ques. 2

Which of the following is a limitation of ex post facto research?
 
  a. lack of control
  b. lack of manipulation
  c. danger of improper interpretation
  d. a and b
  e. All of these are true.

Ques. 3

Choose the type of experimental validity that is being referred to in the following questions. Did the experimental treatment cause the observed change in the dependent variable, or was a spurious factor operating to cause the change?
 
  a. Internal c. Construct
  b. External d. Statistical Conclusion