Which possible outcome is of serious concern with a ...

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Which possible outcome is of serious concern with a repeated-measures study?
 
  A) You will obtain negative values for the difference scores.
  B) The results will be influenced by order effects.
  C) The mean difference is due to individual differences rather than treatment differences.
  D) You lose too many degrees of freedom.

Question 2

A sample has a mean of M = 86. If one new person is added to the sample, and X is unchanged, what effect will the addition have on the sample mean?
 
  A) The sample mean will increase a little.
  B) The sample mean will decrease.
  C) The sample mean will remain the same.
  D) The sample mean will increase substantially.

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Answer to Question 1

B

Answer to Question 2

B