When estimating the variance of a population from the sample,the sample variance cannot be used directly because
A)it is based on using absolute deviations.
B)it is based on using squared deviations.
C)it tends to be slightly too large-it overestimates the population variance.
D)it tends to be slightly too small-it underestimates the population variance.

Question

Quizplus · Accepted Answer

The items below (# 10 - 12)are based on the following scenario. A school psychologist is using a depression inventory-on which a score of 0 indicates no depression and a score of 10 indicates severe depression-to see if the level of depression in fourth graders in a particular class of 20 students differs from that of fourth graders in general at a school.The results of previous testing indicate that fourth graders at the school usually have a score of 5 on the scale,but the variation is unknown.The current sample of 20 fifth graders has a mean depression score of 4.4.

When Estimating the Variance of a Population from the Sample,the