Let us pretend that the U. S. Department of Agriculture does ...

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Let us pretend that the U. S. Department of Agriculture does regular surveys on mature Americans to see what concerns they have with foodborne illnesses.
 
  You hear on the news one night that mature Americans are now 50 times more likely to worry about Mad Cow disease than they were five years ago. You happen to remember that there was an outbreak of Mad Cow disease last year (at around the same time the data were collected). It is possible that the increase in concern over Mad Cow disease is partially due to the recent outbreak. This is an example of __________ being a threat to internal validity.
 
  a. history
  b. maturation
  c. regression to the mean
  d. selection

Question 2

Carefully review the research matrix presented below. If this is a within subjects design, how many total participants will be used in the experiment?
  Immaculate Appearance Neat Appearance Sloppy Appearance
  15 participants 15 participants 15
 
  participants
 
  a. 15
  b. 30
  c. 45
  d. 60

[dyrone]

Answer to Question 1

A

Answer to Question 2

A

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TYSM

[amandalm]

Excellent