To guard against most threats to internal validity in the ...

[PhilipSeeMore]

To guard against most threats to internal validity in the classical experiment the researcher should:
 
  a. focus upon external validity
  b. focus upon generalizability
  c. use random assignment
  d. put subjects only in experimental groups

Question 2

The statement, there are no simple formulas for designing an experimental or quasi-experimental study suggests:
 
  a. that there is an infinite variety of ways to design a study
  b. that there is a finite variety of ways to design a study
  c. that the one constant is the use of randomization in experiments
  d. experiments and quasi-experiments should be used only as a last resort

[meganlapinski]

Answer to Question 1

c

Answer to Question 2

a

[PhilipSeeMore]

Excellent

[epscape]

Gracias!