8 2 measures of central tendency and range
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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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Presentation Transcript
measure of central tendency
Measure of Central Tendency
  • A number used to describe the center of a set of data
  • Mean, Median, Mode
slide3
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
slide4
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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