Statistics: Measures of Spread 2.0 / 5 based on 1 rating ? MathematicsStatistics, averages and distributionsA2/A-levelOCR Created by: Ruth NyeCreated on: 08-03-13 11:10 Sxx for Raw Data ∑(x-¬M)2 = ∑x2-nM2 1 of 9 Sxx for frequency distribution. ∑(x-¬M)2 f = ∑x2 f -nM2 2 of 9 Mean square deviation and RMSD ( Sxx/n) and √(Sxx/n) 3 of 9 Variance and Standard Deviation ( Sxx/n-1) and √(Sxx/n-1) 4 of 9 Outliers Mean± 2.S.D. OR UQ or LQ±1.5xIQR 5 of 9 Extreme Outliers Mean±3.S.D. OR UQ or LQ±3xIQR 6 of 9 Quartiles IQ: UP-LQ, LQ: n/4, UQ: 3(n/4) 7 of 9 Mean, Median, Mid-range, Range Mid-range: (Lowest +Highest)/2, Posiiton of Median: (n+1)/2, Mean: (∑x)/n, Range: Highest-lowest 8 of 9 Estimation of Median in a class Lower class boundry+(position in class/frequency in class)xClass width 9 of 9
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