What is the strongest method of controlling for intrinsic ...

[londonang]

What is the strongest method of controlling for intrinsic (subject) factors?
 
  A) Statistical control
  B) Randomization
  C) Matching
  D) Homogeneity

Question 2

Which of the following situations illustrates control over an external confounding variable?
 
  A) Using a script to relay information about the study.
  B) Randomizing assignment to control treatment groups.
  C) Allowing for maximum flexibility over where data is collected.
  D) Choosing a heterogeneous sample of subjects.

[kusterl]

Answer to Question 1

B
Feedback:
The strongest method of controlling for intrinsic (subject) factors is randomization. It is the most effective method of controlling participants' characteristics. Homogeneity occurs when people who are similar in respect to confounding variables are included in the study. Matching involves consciously forming comparable groups. Statistical control is the ability to have control over confounding variables statistically.

Answer to Question 2

A
Feedback:
Use of a script to relay information about the study illustrates control over an external confounding variable-study context. Randomizing assignment to control the treatment groups, allowing for maximum flexibility over where data is collected, or choosing a heterogeneous sample of subjects does not illustrate control over an external confounding variable but pertain rather to those intrinsic to study participants.