8 2 measures of central tendency and range
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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

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Measure of central tendency
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
Mode examples???

  • No mode

  • One mode

  • Two modes


Median highway medians are in the middle
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
Range

  • Is a “measure of variation”

  • Difference between the least and greatest values


When to use what
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


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