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Summarize and Compare Responses Mean (Average) Median Standard Deviation Mean (Average) Median Standard Deviation

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16, 23, 25, 17, 26, 24, 11, 24, 19, 21, 15, 13, 21, 21, 20, 20, 21, 28, 18, 17, 17, 22, 20, 10, 22, 23, 16, 22, 20, 21, 21, 21, 31, 17, 21, 16, 16, 20, 18, 22, 18, 22, 22, 16, 21, 17, 25, 20, 21, 26 Hypothetical: David Archuleta releases a CD 50 CD buyers, chosen at random. Asked their age. 50 CD buyers, chosen at random. Asked their age.

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16, 23, 25, 17, 26, 24, 11, 24, 19, 21, 15, 13, 21, 21, 20, 20, 21, 28, 18, 17, 17, 22, 20, 10, 22, 23, 16, 22, 20, 21, 21, 21, 31, 17, 21, 16, 16, 20, 18, 22, 18, 22, 22, 16, 21, 17, 25, 20, 21, 26 Hypothetical: David Archuleta releases a CD 50 CD buyers, chosen at random. Asked their age. 50 CD buyers, chosen at random. Asked their age. Mean = 20.1 years Median = 21.0 years Standard Deviation = 4.1 years

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Frequency Table

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Frequency Histogram

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50 responses

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1000 responses

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2000 responses

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3000 responses

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4000 responses

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5000 responses

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6000 responses

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Bell Shaped Pattern

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Gaussian (Normal) Distribution

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Peaked & Symmetric

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2 Inflection Points

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“Spread” in Responses Standard Deviation

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68.3% of Total Area

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CD Sales in Missouri

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Different Mean & Std. Dev.

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Still 68.3% of Total Area

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Skewed Distribution

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Utah Sales Missouri Sales

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