Name: ___________________________________________________
Date: ___________________________________________
FST
Notes: Box Plots
Vocabulary:
1.
Box Plot- ______________________________________________________________________________________________________________________
2.
Quartiles- _____________________________________________________________________________________________________________________
3.
Upper Quartile- ______________________________________________________________________________________________________________
4. Lower Quartile- _______________________________________________________________________________________________________________
5. Inter- Quartile Range- ________________________________________________________________________________________________________
6. 5 Number Summary- _________________________________________________________________________________________________________
Example 1: Listed below you will find the cost (in dollars) of 11 different types of graphing calculators.
88
80
69
68
60
62
110
79
75
63
71
Five Number Summary:
Min:
Q1:
Q2:
Q3:
Max:
FINDING OUTLIERS
1. Compute the Interquartile Range (IQR) = ________________________ = ____________________
2. A number is an outlier if it is 1.5(IQR) greater than Q3 pr 1.5(IQR) less than Q1
Graph Boxplot:
Example 2: Listed below you will find the number of calories in ten different types of ice cream bars.
200
75
151
182
200
135
200
183
151
190
Five Number Summary:
Min:
Q1:
Q2:
Q3:
Max:
Check for outliers:
Graph Boxplot:
Example 3: Double Box Plots
a.) Estimate the range of literacy rates in each region. ___________________________________
b.) True or False: In Latin America, there are more countries with literacy rates of 84% or less than there are
with literacy rates of at least 91%.
Example 4: Analyze and Interpret
a.) What is the median score? ______________________
c.) What is the interquartile range? _______________________
b.) What percent of students scored between 62%
d.) What is the interval of scores of students who rank
and 91%?
below the lower quartile?
e.) Between which two quartiles is there the greatest spread?