Outlier Effects on Mean and Range
aligned to Ccss 8.sp.a.1
Learning Objective
I can describe how outliers affect the mean and range of a data set.
Lesson Flow
Watch Video
What to Report When There is an Outlier - Measures of Central Tendency
ProfKelley
Guided Notes
Key concepts students will learn:
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The mean uses all of the data in a set, but it is easily influenced by outliers.
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The median is the middle value in a sorted data set, and it is the best measure of central tendency to report when there are outliers.
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The mode is the value that occurs most frequently, but it is not robust because small changes in frequency can easily affect it.
Practice
3 questions • Multiple choice & Short answer
Exit Ticket
“A data set of test scores includes the following values: 75, 80, 82, 85, 90, 92, 95, and 30. Identify the outlier in this data set. Then, describe how the outlier affects the mean of the data set.”
Teacher Guide
Get the complete package:
- Answer keys for all questions
- Differentiation strategies
- Extension activities
- Printable student handouts
