Chapter 17 describes how threats to external validity can be ...

[AEWBW]

Chapter 17 describes how threats to external validity can be based on which two of the
  following?
 
  A) experimental methods and participants
  B) experimental methods and the experimenter
  C) the experimenter and statistical issues
  D) participants and the experimenter

Question 2

Instead of studying a thousand rats for one hour each, or a hundred rats for ten hours each, the
  investigator is likely to study one rat for a thousand hours. This quote best describes which
  research approach?
 
  A) pretest-posttest control group design B) quasi-experimental research
  C) Solomon four-group design D) experimental analysis of behavior

[abctaiwan]

Answer to Question 1

A

Answer to Question 2

D

[AEWBW]

Thanks for the timely response, appreciate it

[mcabuhat]

TYSM