Why Do We Use the Sample Standard Deviation for Smaller

Multiple Choice

Why do we use the sample standard deviation for smaller data sets, such as those with less than 20 samples?

A) It's easier to calculate for smaller data sets
B) With smaller sample sets, the standard deviation of the parent population is often overestimated
C) With smaller sample sets, the standard deviation of the parent population is often underestimated
D) Significant figures get jumbled with small data sets
E) I wish I knew. Truly I do.