12.3
Box-and-Whisker Plots
Objectives: Find the range, quartiles, and
inter-quartile range for a data set. Make a box andwhisker plot for a data set.
Standards: 2.6.8E Analyze and display data in boxand-whisker plots.
These five values are referred to collectively
as the “five point summary” for the data set.
TRY THIS:
4
7
Find the 5 point summary and the IQR for
the data set below. Identify any outliers.
9 31 34 2 35 37 24 34 31 50
11 33 36 2
min = 2
Q1 = 10
median = 33.5
Q3 = 51
max = 83
IQR = 41
8 13 52 57 60 69 78 83
Low Outliers?
Q1 – 1.5(IQR)
= 10 – 1.5(41)
= 10 – 61.5
= -51.5
No values below -51.5
No low outliers
High Outliers?
Q3 + 1.5(IQR)
= 51 + 1.5(41)
= 51 + 61.5
= 112.5
No values above 112.5
No high outliers
Making a Box-and-Whisker on a Piece of Paper:
Page 786:
Do #7 & 8
Homework
• pg. 786 # 15-22, 27-29
• ANOTHER EXTRA CREDIT OPPORTUNITY!!
– p 786 # 23 – due Friday
• Quiz TOMORROW on 12.1 – 12.3
• Optional Homework – worth 10 points if
handed in tomorrow ~ 12-3 practice
(front and back)