SDS Unit 1 Exam Vocab (Z-Scores)

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7 Terms

1
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z-score

measure of how far a score is from the mean (in units of standard deviations)

2
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68-95-99.7

rule of thumb for area under the Normal model, within 1, 2, or 3 SD of the mean

3
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nearly normal condition

is the distribution unimodal and roughly symmetric?

4
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normal percentile

the area under the normal curve to the left of a z-score

5
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outlier

extreme value in a distribution

6
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left skewed

distribution with a tail that extends to the left

7
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right skewed 

distribution with a tail that extends to the right