In running multiple comparisons in a repeated-measures design we can use procedures that we would ...

In running multiple comparisons in a repeated-measures design we can use procedures that we would use with independent groups designs because
 
  a. the error term is corrected for any lack of independence in the data.
  b. the error term is a conservative one.
  c. the multiple comparison procedures we use have nothing to do with the question of independence or lack of it.
  d. we create our own adjusted error term for multiple comparisons.

Question 2

If, in the example of a headache study used in the text, all subjects had been studied over the same period of time, differences that might be caused by stressful times (such as Christmas) would
 
  a. contaminate the results.
  b. add to the usefulness of the results.
  c. improve the generalizability of the study.
  d. reduce the variability in the scores.