Statistic Formulas 3.0 / 5 based on 1 rating ? StatisticsStatistics, GCSE, EdexcelGCSEEdexcel Created by: SimoneCreated on: 22-06-13 17:09 Formula for finding an angle in a pie chart? Angle = number in category / total number X 360 1 of 21 Frequency? Frequency = Class Width X Frequency Density 2 of 21 Position of Median (n + 1) / 2 3 of 21 Q1 (n + 1) / 4 4 of 21 D1 (n + 1) / 10 5 of 21 P1 (n + 1) / 100 6 of 21 Outliers in Box Plots (lower) values > Q3 + 1.5(Q3 - Q1) 7 of 21 Outliers in Box Plots (Greater) values < Q1 - 1.5(Q3 - Q1) 8 of 21 Standardised score value - mean / Standard Deviation 9 of 21 Index Number value / value in base year X 100 10 of 21 Weighted Index sigma (index number X weight) / Sigma weights 11 of 21 seasonal effect real value - value from trend line 12 of 21 If all possible outcomes are equally likely? number of matching outcomes / total outcomes 13 of 21 Relative Frequency probability of something happening = number of times it happened / number of trials 14 of 21 expected frequency? expected frequency = number of trials X probabilty of outcome 15 of 21 mutually exclusive P (A or B) = P (A) + P (B) 16 of 21 Non-Mutually Exclusive P (A or B) = P (A) + P(B) - P(A and B) 17 of 21 Independent Events P (A and B) = P (A) X P(B) 18 of 21 At least one P (at least 1) = 1 - P(none) 19 of 21 General Multiplication Law P(A and B) = P(A) X P(B given A occurs) 20 of 21 Rearranged Conditional Probabilities P (B given A occurs) = P(A and B) / P(A) 21 of 21
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