Finding Outliers with Fences
Authored by Barbara White
Mathematics
9th Grade
Used 2+ times
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11 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
How do we calculate the IQR of a data set?
Q1 + Q3
Q3 - Q1
Q1 - Q3
2.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
When using the IQR to find outliers, which formula will identify the upper fence?
Q3 - 1.5(IQR)
Q1 + 1.5(IQR)
Q1 - 1.5(IQR)
Q3 + 1.5(IQR)
3.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
When using the IQR to find outliers, which formula will identify the lower fence?
Q3 - 1.5(IQR)
Q1 + 1.5(IQR)
Q1 - 1.5(IQR)
Q3 + 1.5(IQR)
4.
MULTIPLE CHOICE QUESTION
3 mins • 5 pts
Given the data set: 23, 34, 27, 12, 30, 26, 28, 31, 34
Find the IQR.
8
9
24.5
32.5
5.
MULTIPLE CHOICE QUESTION
3 mins • 5 pts
DO NOT CLEAR YOUR CLACULATOR!
The IQR for the data set was 8 and Q1 = 24.5.
What is the lower "fence" for the data set?
24.5
8
12.5
1.5
6.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
Using the formula Q1 - 1.5(IQR), you get a lower fence of 12.5.
Data set: 23, 34, 27, 12, 30, 26, 28, 31, 34
Are there any values lower than 12.5 in the data set?
yes
no, there are no outliers on the low end of the data
7.
MULTIPLE CHOICE QUESTION
1 min • 5 pts
Since there are numbers less than 12.5, what is the outlier?
12.5
12
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