STATS 1123 - NORMAL DISTRIBUTION

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Last updated 4:26 PM on 1/22/26
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7 Terms

1
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density curve

  • total area under always equal to 1 or 100%

  • non-negative

2
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68-95-99.5 rule

the section from the mean, 68 is the area of the first section from the mean +-standard deviation

3
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N(12,4) meaning

12 is the mean of the data

4 is the standard deviation from the mean

4
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z-score

  • data less than the sample mean will have a z-score less than 0

  • data more than the sample mean will have a z-score more than 0

<ul><li><p>data less than the sample mean will have a z-score less than 0 </p></li><li><p>data more than the sample mean will have a z-score more than 0</p></li></ul><p></p>
5
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how to find the right area of a normal distribution

area right of z = 1 - area left of z

6
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how to calculate the area between 2 values

** do not subtract z values from each other

<p>** do not subtract z values from each other </p>
7
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The formula to find X in a normal distribution

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