The average age of students at KSU increased from 22 with a standard deviation of 3.96 to an average age of 24 with a standard deviation of 4.08. The relative dispersion around the mean

a.) Decrease

b.) Increase

c.) Stayed the same

d.) Disappeared

Answer: A

Since the mode is the most frequently occurring data value, it

a.) can never be larger than the mean

b.) is always larger than the median

c.) is always larger than the mean

d.) None of these alternative is correct

Answer: D

Which of the following is not a measure of dispersion?

a.) mode

b.) standard deviation

c.) range

d.) interquartile range

Answer: A

During a cold winter, the temperature stayed below zero for ten days (ranging from -20 to -5). The variance of the temperatures of the ten day period

a.) is negative since all the numbers are negative

b.) must be at least zero

c.) cannot be computed since all the numbers are negative

d.) can be either negative or positive

Answer: B