________ are used if researchers want to estimate the range of ...

[cool]

________ are used if researchers want to estimate the range of scores in a distribution that is
  likely to include a particular characteristic of a population, like the mean.
 
  A) Mean squares B) SD scores
  C) Interval estimates D) z scores

Question 2

How do nuisance variables affect the scores in a distribution?
 
  A) decrease the difference between two distributions
  B) increase the difference between two distributions
  C) decrease the spread of scores
  D) increase the spread of scores

[s.meritte]

Answer to Question 1

C

Answer to Question 2

D

[cool]

Excellent

[ryhom]

Thanks for the timely response, appreciate it