Chapter 5

Question 1

range

Answer 1

the difference between the largest and the smallest values in a set of data; provides a relatively insensitive measure of variability

Question 2

interquartile range

Answer 2

the range of the central 50% of the data; the difference between the first quartile and the third quartile

Question 3

deviation

Answer 3

the distance of an observation in a data set from the mean of the set; negative = observation was smaller than mean; positive = observation was larger than mean

Question 4

variance

Answer 4

the average squared deviation of the observations in a set from the mean of that set

Question 5

standard deviation

Answer 5

the average deviation of the observations in a set from the mean of that set; the square root of the variance