MAT 137 Midterm

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Last updated 7:02 PM on 4/16/26
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9 Terms

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Deviation between 2 pints

distance and direction between 2 points

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Sample variance

measures the average squared deviation from the sample mean

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sample standard deviation

  • defined as s

  • positive square root of the sample variance, s². So, s = sqrts²

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Empirical rule

If the distribution (histogram) of the sample/population is mound shaped and symmetric,

  • approximately 68% of the measurements will fall within 1 standard deviation of the mean

  • approximately 95% of the measurements will fall within 2 standard deviations of the mean

  • approximately 99.7% (basically all) the measurements will fall within 3 standard deviations of the mean

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what is the symbol for sample mean

x̄

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What is the symbol for sample standard deviation

s

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what is the symbol for population mean

μ (mew)

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What is the symbol for population standard deviation

σ (sigma)

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