What threats to internal validity are reduced when you switch ...

[gbarreiro]

What threats to internal validity are reduced when you switch from a one group pretest-posttest to a static comparison group design? What potential threat is introduced?
 
  What will be an ideal response?

Question 2

Identify two heuristics for developing research ideas involving (a) naturally occurring events, (b) simple analyses, (c) complex analyses, or (d) analysis of previous research.
 
  Briefly describe a research project that involves the heuristics you described.
  What will be an ideal response?

[T4T]

Answer to Question 1

When you use a static comparison group design instead of a one group pretest-posttest design, you can reduce the threats of history and maturation. (History can still exist if the two groups are separated so that one is affected by outside events that don't affect the other.) By including a second group in the static comparison group, though, you now have to worry about selection threats if your groups are nonequivalent.

Answer to Question 2

a. intensive case studies or examination of similar problems already studied
b. reverse the direction of a commonsense hypothesis
c. generating an if-then hypothesis
d. conceptual replication or replication with extension