ECON 100A Lecture Notes - Lecture 3: Statistical Inference, Summary Statistics, Standard Deviation
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Eyeballing the iqr rectangle: qi: 150, q2: 170, q3: 190. Iqr = q3-q1 = 190-150 = 40 triangle: bring the red lines more toward the middle (estimate where we"d have four equal parts) Dispersion: summary statistic (indicative of what spread is) Standard deviation vs aad* probably on next exam inferential statistics: you"re guessing. Mean and median for symmetric shape is in the middle. Q1 and q3 will typically be our aad lines. Standard deviation is a little bit bigger than aad (step 3: estimate the aad) first red line around 32 if your shape has a length of 100 +2 is a good guess. [20, 100): aad+2 = standard deviation: 0, 30, 30, 70. Every 100 after 100 add another point. Test two (october 23, 2015: [rectangle with 0 on the left corner and 100 on the right corner] Aad is the distance from mean to q1 or to q3. Aad = 25, sd = (25+2) 27.
