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8-2 Measures of Central Tendency and Range

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# 8-2 Measures of Central Tendency and Range - PowerPoint PPT Presentation

8-2 Measures of Central Tendency and Range. Measure of Central Tendency. A number used to describe the center of a set of data. Mean, Median, Mode. Mean. The sum of the data divided by the number of items in the set “average” The average teacher is Mean

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### 8-2 Measures of Central Tendency and Range

Measure of Central Tendency
• A number used to describe the center of a set of data
• Mean, Median, Mode
Mean
• The sum of the data divided by the number of items in the set
• “average” The average teacher is Mean
• Ex: 1 cm, 1 cm, 5 cm, 2 cm, 2 cm, 4 cm, 2 cm, 5 cm
Mode
• The number that occurs most often.
• Mode = most often
Mode examples???
• No mode
• One mode
• Two modes
MedianHighway medians are in the middle.
• After the data set has been ordered least to greatest, it is the middle number or the mean(average) of the two middle numbers
• Ex: 15 yd, 7 yd, 20 yd, 17 yd, 11 yd, 20 yd
Range
• Is a “measure of variation”
• Difference between the least and greatest values
When to use what???
• Mean- when data has no outliers
• Median- when data has outliers and there are no big gaps in the middle of the data
• Mode- data has many identical numbers
• Range- to describe the spread of data