Measures of Variation

Find the Lower Quartile (Q1) of the following numbers:

84, 88, 72, 74, 98, 16, 94

• 72

• 88

• 94

• There is no Lower Quartile.

Find the Upper Quartile (Q3) of the following numbers:

• 72

• 88

• 94

• There is no Upper Quartile.

Find the IQR of the following numbers:
84, 88, 72, 74, 98, 16, 94 

• 78

• 22

• 16

• There is no IQR.

What is the IQR of this data set?

• 5

• 6

• 8

• 9

the difference between the greatest number and the least number in a set of data

• mean

• mode

• range

• average

a measure used to describe the distribution of data

• outliers

• mode

• first quartile

• measures of variation

a measure of variation in a set of numerical data, computed by adding the distances between each data value and the mean, then dividing by the number of data value

• mean absolute deviation

• third quartile

• median

• mode

a measure of variation in a set of numerical data, the distance between the first and third quartiles of the data set

• average

• mean

• interquartile range

• statistical question

Which best describes the range of a set of data?

• The most frequent value

• The difference between the lowest and highest value

• The middle value

• The average

Which set of data has a range with the greatest variation?

• 13, 22, 33, 9, 16

• 41, 32, 29, 35, 24

• 27, 37, 42, 31, 49

• 13, 25, 36, 17, 30