A weighted average is (Multiple Choice)

A weighted average is
 
  a. the average of two weights.
  b. an average that gives greater influence to the larger sample.
  c. an average that reduces the influence of the larger sample.
  d. the balance between the sample size and the mean.

Question 2

Our assumption that population variances are equal is called the assumption of
 
  a. equal dispersion.
  b. heterogeneity of variance.
  c. homogeneity of variance.
  d. pooled variances.

Question 3

The reason that we pool variances is to
 
  a. inflate our error term.
  b. get a better estimate of error variance.
  c. reduce the sample variance.
  d. increase the size of t.