Question

1. In general, why should we use the standard deviation rather than the variance?

A. The standard deviation is a smaller number.

B. The standard deviation is the same as the mean.

C. The standard deviation is a measure of central tendency.

D. The standard deviation is more frequently used in psychology than the variance, primarily because the standard deviation is better expressed in the same units as the original data set.

2. Your friend Bill (a man) tells you that he has a shoe size of 29 centimeters. Is this within the range of one standard deviation (either above or below) the mean for men’s shoe size?

A.Yes, it is within one standard deviation above the mean

B. No, his shoe size is not within one standard deviation above or below the mean

C. There is not enough information to answer this question

D. Yes, it is within one standard deviation below the mean

Answer 1

1)

(D) The standard deviation is more frequently used in psychology than the variance, primarily because the standard deviation is better expressed in the same units as the original data set.(this is measure of dispersion), a another reason is for normal distribution it can measure how much proportion can come within 1 & 2 & 3 s.d from mean.

2

(C) There is not enough information to answer this question. (since here the sample or population mean and standard deviation is not given so how can we verify.)