STAB22H3 Study Guide - Midterm Guide: Bar Chart, Confounding, Pie Chart
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STAB22H3 Full Course Notes
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Also look for modes (one mode = unimodal) and symmetric or skewed. Histogram: breaks variables into intervals and displays counts in each interval, not actual values. Cumulative frequency: start off with initial variable and add each time. Central tendency: tendency of data to cluster near the centre. Trimmed mean: more resistant, discard highest 10% and lowest 10% for 10% trimmed mean, eliminates effect of outliers. Two measures of spread: range and standard deviation. Range: measure of spread, extremely sensitive to outliers (max-min) S^2= (xi-x) / n-1 and standard deviation is just square-root of that formula. S only used if mean s used as measure of center. Ballpark approximation: range divided by 4 (3 if less than 10 observations, 5 if more than. First quartile: 25th percentile, to the left of the ordered list (n+1) x (25/100) Third quartile: 75th percentile, to the right of the ordered list (n+1) x (75/100)