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9028852
GCSE:Statistics Formula Sheet
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Mind Map on GCSE:Statistics Formula Sheet, created by Filip Jinga on 21/05/2017.
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Filip Jinga
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Filip Jinga
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Resource summary
GCSE:Statistics Formula Sheet
Pearson's Product Moment Correlation
r=Sxy÷√(SxxSyy)
Sxy= Σxy(ΣxΣy÷n)
Sxx=Σx²-(Σx)²÷n
Syy=Σy²-(Σy)²÷n
Symbols
<=Less Than
>=More Than
≥ =Grater Than or Equa to
≤= less than or equal to
Pie Charts
Angle in Pie= Number in Category÷Total Number of Values x 360
Frequency Density
Frequency Density= Frequency÷ Class width
Frequency= Frequency Density x Class Width
Mean
x̅=∑x÷n or x̅=∑fx÷∑f
Standard Deviation
√∑fx²÷∑f-x̅
Q1,Q2,Q3,IQR
Q1=n+1÷4
Q2=n+1÷2
Q3=Q1+Q2
IQR=Q3-Q1
Outliers are values that are:>Q1+1.5(Q3-Q1) or <Q1-1.5(Q3-Q1)
Index Numbers
Value÷VAlue in Base Year x 100
Weighted Index Number= ∑(index no. x weight)÷∑wright
Probability
P of an Event= Number of outcomes matching event÷total number of outcomes
P of Something Happening= No. of Times its happened÷ Number of Trials
Mean Co-ordinates
Mean X Co-Ordinate=∑x÷n
Mean Y Co-Ordinate=∑y÷n
Equation of the Line
y=mx+c
m=gradient
c= Where the line goes through the y axis
Standerdised Value
Value-Mean÷Standard Deviation
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