OUTLIERS & THE MEASURES OF VARIABILITY

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11 Terms

1
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Values that are quite different from the rest of the data. If numbers are outside of these limits, they are called…..

Outliers

2
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Formula for Outliers

IQR = Q3 - Q1

3
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Formula to find the upper and lower outliers.

Q3 + (1.5*IQR) for Upper

Q1 - (1.5*IQR) for Lower

4
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Refers to how spread scores are in a distribution out, it refers to the amount of spread of the scores around the mean.

Variability

5
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What are the ways of describing a variability spread?

  • Range

  • Interquartile range

  • Variance and Standard Deviation

6
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The difference in the maximum and minimum values of a data set.

Range

7
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Formula for Range

Range = maximum - minimum

8
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The difference between upper and lower quartiles.

Interquartile Range

9
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Formula for IQR

IQR = Q3 - Q1

10
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The average squared distance from the mean.

Variance

11
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The square root of the variance.

Standard Deviation