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

When the smallest and largest percentage of items are removed from a data set and the mean is computed, the mean of the remaining data is

a.) the median

b.) the mode

c.) the trimmed mean

d.) any of the above

Answer: C

The coefficient of correlation

a.) is the same as the coefficient of determination

b.) can be larger than 1

c.) cannot be larger than 1

d.) cannot be negative

Answer: C