Measures of Variation

When calculating the range of a data set, I need to...

• subtract:

  least number - greatest number

• subtract:

  greatest number - least number

• subtract:

  Q₁ - Q₃

• subtract:

  Q₃ - Q₁

Roger bowled 5 games last weekend. His scores are: 165, 138, 172, 127, 193. What is the range of Roger's scores?

• 193

• 127

• 60

• 66

Which measure of variation is the difference between the first quartile and the third quartile (Q3 - Q1)?

• mean

• range

• interquartile range (IQR)

• median

What is this called: The median of the first half of the data

• mean

What is this called: The median of the second half of the data

• mean

Find the range of this data

(hint: order this data on paper from least to greatest -- you will see it again in some more questions!)

Hours Sixth Graders Spent Playing Video Games This Week:

0, 10, 4, 20, 2, 11

• 4

• 11

• 10

• 20

Find the first quartile (Q1) of this data.

 (hint: this is the same data as the previous question)

Hours Sixth Graders Spent Playing Video Games This Week:

0, 10, 4, 20, 2, 11

• 0

• 2

• 11

• 20

Find the third quartile (Q3) of this data.

(hint: this is the same data as the previous question)

Hours Sixth Graders Spent Playing Video Games This Week:

0, 10, 4, 20, 2, 11

• 20

• 2

• 11

• 0

Find the interquartile range (IQR) of this data.

(hint: this is the same data as the previous question)

Hours Sixth Graders Spent Playing Video Games This Week:

0, 10, 4, 20, 2, 11

• 2

• 7

• 9

• 11