Reading & Creating Box & Whisker Plots

Reading & Creating Box & Whisker Plots

Box-and-Whisker Plot

A way to display data on a number line by organizing it into 4 sections

5 Number Summary

• Minimum Value: smallest value

• Lower Quartile: the median of the lower half

• median: The middle value (small -> large)

• Upper Quartile: the median of the upper half

• Maximum Value: The largest value

Quartiles

the four (4) sections that make up the box plot. Each quartile represents 25% of the data.

Interquartile Range

the range between the lower quartile and the upper quartile or the length of the box

Multiple Choice

What do points A and E represent on the box plot?

• Mean and Mode

• Mean and Median

• Least and Greatest Value

• First and Third Quartiles

Multiple Choice

What do points B and D represent on the box plot?

• Mean and Mode

• Mean and Median

• Least and Greatest Value

• First and Third Quartiles

Multiple Choice

What does point C on the box plot represent?

• First Quartile

• Median

• Third Quartile

• Mean

Multiple Choice

What is the median of the data?

• 200

• 100

• 90

• 140

Multiple Choice

What value is the lower quartile?

• 66

• 58

• 60

• 64

Multiple Choice

What data value is the upper quartile (Q3)?

• 64

• 62

• 66

• 58

Multiple Choice

What is the minimum value?

• 64

• 58

• 66

• 60

Multiple Choice

What is the maximum value?

• 64

• 58

• 66

• 60

Multiple Choice

What are your numbers ordered from least to greatest? (12, 8, 22, 34, 15, 18, 4, 11, 17, 34)

• 4, 8, 11, 12, 15, 17, 18, 22, 34, 34

• 34, 34, 22, 18, 17, 15, 12, 11, 8, 4

• 8, 11, 12, 15, 17, 18, 22, 34

• 4, 8, 11, 15, 16, 18, 22, 24

Multiple Select

What is the minimum and maximum?

• 4

• 12

• 34

• 8

• 11

Multiple Choice

Now lets find the median, what do you do to find it?

• Cross off my numbers in pairs until I get one or two in the middle

• Add all of my numbers together

• Find the most common one

• Subtract the largest and smallest

Multiple Choice

We have two numbers in the center, what do we do to find the median?

• Nothing, we have two medians

• Add them and divide by 2

• We choose the one we like the most

Fill in the Blank

What is the median? (Your numbers were 15 & 17)

Fill in the Blank

What do you think is the lower quartile?

Fill in the Blank

What do you think is the upper quartile?

Multiple Choice

What is the interquartile range? (Q3 - Q1)

• 33

• 11

• 26

• 23