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Statistics
S1 Formula
28
Mathematics
11th Grade
06/04/2007

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Term
A Statistical Experiment
Definition
A process used for collecting data to provide evidence for and against a hypothesis
Term
An event
Definition
A subset of possible outcomes of an experiment
Term
A Discrete Variable
Definition
a variable that can only take whole number values
Term
A Qualitative Variable
Definition
A variable that cannot be represented by numbers
Term
A Continuous Variable
Definition
A variable that can take any numerical value within a given range
Term
Descriptive Statistics
Definition
Concerned with techniques for collecting, grouping, summarising and presenting data
Term
Inferential Statistics
Definition
Concerned with techniques for reaching a conclusion on a population when only a sample is available
Term
A statistical model
Definition
A Statistical process to describe or make predictions about the expected behaviour of a real world problem
Term
Negatively Skewed
Definition
Mode > Median
Q2-Q1>Q3-Q2
Term
Positively Skewed
Definition
Mode
Term
Mean
Definition
Ex/n
Term
Standard Deviation
Definition
SqRoot Ex^2/n - mean^2
Term
Conditional Probability - P(A|B)
Definition
= P(AnB)/P(B)
Term
Conditional Probability - P(AuB)
Definition
P(A) + P(B) - P(AnB)
Term
Conditional Probability - P(AnB)
Definition
P(A|B) * P(B)
Term
Independent Events - P(AnB)
Definition
P(A) * P(B)
Term
Independent Events P(B|A)
Definition
P(B)
Term
Sxx
Definition
Ex^2 -(Ex)^2/n
Term
Syy
Definition
Ey^2 - (Ey)^2/n
Term
Sxy
Definition
Exy - (Ex)(Ey)/n
Term
PMCC
Definition
Sxy over sqRoot of Sxx * Syy
Term
Regression Line
Definition
y=a+bx
Term
RL - b
Definition
Sxy/Sxx
Term
RL- a
Definition
mean of y - b*mean of x
Term
Var(X)
Definition
E(X^2) - E(X) ^2
Term
E(aX+B)
Definition
aE(X) + B
Term
Var(aX+B)
Definition
a^2Var(X)
Term
Normal Distribution
Definition
z=x - mean over standard deviation
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