The numerical difference between the raw score and the mean, when divided by the standard ...

The numerical difference between the raw score and the mean, when divided
  by the standard deviation, yields the
 
  a. normal curve
  b. percentile
  c. first moment of the curve
  d. z score

Question 2

One measure of the overall sampling error in the entire distribution of
  sample means is the
 
  a. standard error of the mean
  b. population mean
  c. population median
  d. sample's true amount of bias

Question 3

The design of this study is an example of
 
  a. the between-subjects method
  b. the before-after method
  c. the matched-subjects method
  d. the repeated measures method