STAT141 Study Guide - Midterm Guide: Venn Diagram

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Iqr = q3 - q1 (between q3 and q1 is where the central 50% of data lies) S = square root the sum of (y1 - y2) squared divided by (n-1) If a value is above q3 + 3iqr or below q1 - 3iqr then it is called a far outlier: weekly pay off questions: if everybody gets a raise, everything gets changed except range, iqr, and sd. If everybody gets a 20% raise, everything changes by adding the 20%!! z= (y-u)/sd >> a steer weighing 1000 pounds is ____(z) standard deviations below the mean. 68-95-99. 7% rule z score table - area left of line linear association - appears as a cloud or swarm of points in a generally consistent straight form, not curved/exponential moderately strong association - clustered. Correlation (r) - strength of relationship b/w x & y variables (for linear relatioreanships) Residuals- (y - y hat) vertical distance from the point to the line.

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