To determine the amount of variance in one measure due to the other measure you would calculate: ...

To determine the amount of variance in one measure due to the other measure you would calculate:
 
  a. sum of squares.
  b. z2 ? 100/SD.
  c. r2 ? 100.
  d. z-score.

Question 2

If the correlation between practice and performance accuracy is .80, how much of the variance in performance is not accounted for by practice?
 
  a. 6.4
  b. 20
  c. 36
  d. 64

Question 3

If two variables are not related in any way, the coefficient of correlation must be:
 
  a. ?1
  b. 1
  c. 0
  d. .5

Question 4

If the correlation between age and memory is ?.30, how much of the variance in memory is accounted for by age?
 
  a. .09
  b. .9
  c. 9
  d. 90