AP Statistics Midterm Review - One Variable Data

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11 Terms

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standard deviation

The average distance of individual measurements from the mean.

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IQR

The difference between the Third Quartile and the First Quartile

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High Outlier

Greater than Q3 + 1.5(IQR)

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Low Outlier

Less than Q1-1.5(IQR)

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z-score

the number of standard deviations an observation is from the mean

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For symmetric distributions

the mean and median are the same

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For distributions that are skewed high

the mean is greater than the median

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Adding a constant to all data values

Increases the measures of center but not measures of spread

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Multiplying all data values

Changes the measures of center and the measures of spread.

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Census

measurements or observations from the entire population are used

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Sample

measurements or observations from part of the population are used