STATISTICS Key Formulas

Description

Statistics Formulas for OCR MEI S1
Chloe Drewery
Flashcards by Chloe Drewery, updated more than 1 year ago
Chloe Drewery
Created by Chloe Drewery almost 7 years ago
17
3

Resource summary

Question Answer
MEAN MEAN = The sum of all the values / The total number of values.
SUM OF SQUARES Sxx = Sum of (X-Mean)squared / n
VARIANCE S^2 = Sxx / n-1
MEAN SQUARE DEVIATION MSD = Sxx / n
ROOT MEAN SQUARE DEVIATION The square root of Sxx / n
STANDARD DEVIATION The square root of Sxx / n-1
OUTLIER TEST Either 1.5 x IQR or Mean ± 2s
PROBABILITY OF A AND B P(AandB)
PROBABILITY OF A OR B P(AUB)
PROBABILITY OF NOT A 1 - P(A)
PROBABILITY OF A OR B P(A) + P(B) - P(AandB)
PROBABILITY OF B GIVEN A P(BIA) = P(AandB) / P(A)
EXPECTED VALUE OF X E(X) = Sum of Xi Pi
VARIANCE OF X Var(X) = E(X^2) - (E(x))^2
COMBINATIONS n! / (n - r)! r!
PERMUTATIONS n! / (n - r)!
Show full summary Hide full summary

Similar

AS level Maths Equations to Remember
Gurdev Manchanda
All AS Maths Equations/Calculations and Questions
natashaaaa
Fractions and percentages
Bob Read
GCSE Maths Symbols, Equations & Formulae
Andrea Leyden
FREQUENCY TABLES: MODE, MEDIAN AND MEAN
Elliot O'Leary
HISTOGRAMS
Elliot O'Leary
CUMULATIVE FREQUENCY DIAGRAMS
Elliot O'Leary
GCSE Maths: Geometry & Measures
Andrea Leyden
GCSE Maths: Understanding Pythagoras' Theorem
Micheal Heffernan
Using GoConqr to study Maths
Sarah Egan
New GCSE Maths
Sarah Egan