Measures of Variation: Interquartile Range

Measures of Variation: Range and IQR

CCSS: 6.SP.4

Learning Target

I will be able to find the difference between the greatest and least value of a data set.

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I will be able to divide the data set into quartiles and understand the meaning of the interquartile.

Fill in the Blank

Find the range of the data set.

4, 8, 2, 9, 5, 3

Open Ended

What do you think Interquartile range means?

Vocabulary

Quartiles of a data set divide the data into four equal parts.

Vocabulary

Interquartile is the center two quartiles that equal 50% of the data.

Interquartile Range (IRQ) is the range of the middle half of the data.

Identifying Quartiles:

• Step 1: Find the MEDIAN of the entire data set. This Is Q2

• Step 2: Find the median of LOWER half of the data set. This is Q1.

• Step 3: Find the median of UPPER half of the data set. This is Q3.

Finding the Interquartile Range

Video presentation

Poll

How are you feeling?

Multiple Select

Identify Q1, Q2, and Q3 of the data set below:

3,4,4,5,6,8,8

• 3

• 4

• 5

• 6

• 8

Multiple Choice

Identify the Interquartile Range of the given data set below: (Hint: Q3 - Q1)

3, 4, 4, 5, 6, 8, 8

• 5

• 4

• 8

Multiple Select

Identify Q1, Q2, and Q3 of the data set.

18, 21,24,28,37,36,30,31,32,22

• 29

• 21.5

• 30

• 22

• 32

Multiple Choice

Identify the Interquartile Range IQR of the data set.

18, 21,22,24,28,30,31,32,36,37

• 29

• 18

• 10

• 37

Reminder: Homework Drag and Drop Worksheet