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 Internal Quartile Range= IQR = Q3-Q1 Determining Outliers Q3 + 1.5 * IQR Q1 - 1.5 * IQR For Calculator STAT---->(CALC) 1:1-Var Stats (Data must be enter in L1/L2) Density Curve Always on/above horizontal axis. Area of exactly 1 underneath. Density Curve Drawings 68-95-99.7 Rule 68% of observations within 1 standard deviation. 95% of observations within 2 standard deviations. 99.7% of observations within 3 standard deviations. Z-Score z=(x-U)/o U is mean population. o is standard deviation. x is observed. To find the area to the left of the z score uner the standard normal cure use table a then find z score on table number that corresponds to z score on the table= area under curve to left of the z score Working w/Interval ex:What % of 14 year old boys have a blood cholesteral level between 170-240 mg/dl U=170 O=30 ? Step1: State the problem- We want the proportion of boys with 170