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Tells how many standard deviations a value is away from the means. They do not have units, so we can compare two different values.
Says 68% fall within 1 standard deviation, 95% of data fall within 2 standard deviations, 99.7% of data fall within 3 standard deviations
Variables that you can use to account for, explain or predict the Y variable (X)
A variable other than X and Y that affects both variables accounting for the correlation between the two
Data points that pull the line lose to them so they can have a great effect on slope and intercept
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