4.4

Question 1

definitional formula

Answer 1

SS= Σ(X-M)²

Question 2

computational formula

Answer 2

SS= ΣX²- ( ΣX)²/n

Question 3

sample variance

Answer 3

sample variance =s² =SS/n-1

Question 4

sample standard deviation

Answer 4

is represented by the symbol s and equal to the square root of the sample variance
√s²

Question 5

degree of freedom

Answer 5

For a sample of n scores, the degrees of freedom, or df, for the sample variance are
defined as df =n-1. The degrees of freedom determine the number of scores in
the sample that are independent and free to vary.

Question 6

sample variance formula

Answer 6

SS/df= SS/n-1