Chapter 4: Variance

Question 1

How does calculating the sample variance differ from calculating the population variance?

Answer 1

The denominator for the sample variance is (n-1), not N

Question 2

A researcher selects a population of eight scores where SS = 72. What is the population variance in this example?

Answer 2

sigma^2=9

Question 3

Sum of Squares

Answer 3

Sum of the squared deviations of scores from their mean

Question 4

degrees of freedom for sample variance

Answer 4

all scores are free to vary except one (n-1)