The calculational formula for variance differs from the ...

[mckennatimberlake]

The calculational formula for variance differs from the definitional formula because the calculational formula _____.
 
  a. does not require the computation of deviation scores
  b. uses only raw scores, number of scores, and the mean
  c. is more efficient
  d. all of these

Question 2

If a deviation score is positive, _____.
 
  a. the raw score lies above the mean c. the raw score is an extreme score
  b. the mean lies above the raw score d. the mean is an extreme score

[djofnc]

Answer to Question 1

D
The calculational formula does not require computation of deviations from the mean. It is more efficient because it utilizes only the raw scores, the number of scores, and the mean.

Answer to Question 2

A

[mckennatimberlake]

Excellent

[T4T]

Great answer, keep it coming