With regard to threats to internal validity, which of the ...

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With regard to threats to internal validity, which of the following is not related to your methods?
 
  A) replication with extension
  B) reactive arrangements
  C) interaction of selection and treatment
  D) multiple-treatment interference
  E) interaction of testing and treatment

Question 2

You just completed a study with one IV which had 4 levels and randomly formed groups. Now
  you are ready to interpret the results of your one-way ANOVA for independent groups source
  table.
 
  How many values should you expect to see for the degrees of freedom?
  A) 4
  B) 2
  C) 1
  D) 3
  E) cannot determine

[duke02]

Answer to Question 1

A

Answer to Question 2

D