Chapter 6- Measures of Dispersion

Question 1

asymmetric distribution

Answer 1

A frequency or percentage distribution that is not perfectly balanced about its midpoint.

Question 2

average deviation

Answer 2

The average (absolute) difference between the mean and all other values in a set of data, ignoring the sign of the difference.

Question 3

bimodal distribution

Answer 3

A data distribution with two distinct peaks where observations tend to cluster.

Question 4

interquartile deviation

Answer 4

In a frequency or percentage distribution, the two data values that cut off the middle 50% of all values.

Question 5

measures of dispersion

Answer 5

Statistics designed to reveal how closely the data do or do not cluster around the mean.

Question 6

negatively skewed data

Answer 6

A frequency distribution that has a few extremely low numbers or data values that distort the mean.

Question 7

positively skewed data

Answer 7

A frequency distribution that has a few extremely high numbers or data values that distort the mean.

Question 8

range

Answer 8

A measure of dispersion calculated by subtracting the smallest value in a distribution from the largest value.

Question 9

standard deviation

Answer 9

A measure of dispersion; the square root of the average squared deviation from the mean (i.e., the variance).

Question 10

symmetric distribution

Answer 10

A frequency or percentage distribution that is perfectly balanced about its midpoint.

Question 11

uniform distribution

Answer 11

A frequency (percentage) distribution in which each data value or set of values occurs with equal frequency (percentage).

Question 12

variance

Answer 12

The average squared deviation from the mean; the square of the standard deviation.