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Intro to Statistics
Testing Hypotheses, Samples, Population
13
Mathematics
Undergraduate 1
11/17/2010
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Term
̄x = Σ / n
 Definition
Sample Mean
Term
ˆp = X n
 Definition
Sample Proportion
Term
s2 = Σ(x − ̄x)2
------
(n−1)
 Definition
Sample Variance
Term
μ
 Definition
Population Mean
Term
p (italicized)
 Definition
Population Proportion
Term
σ2
 Definition
Population Variance
Term
A characteristic of the population under study (often unknown), a function of the target population.
 Definition
Parameter
Term
( ˆp − p )= ˆp
 Definition
Find Sample Error in ˆp
Term
( ̄x − μ )= ̄x
 Definition
Sampling Error in ̄x
Term
Moreover if n is large and p is not not
too close to 0 or 1, then the Z-score is approximately standard normal.
 Definition
The Normal Approximation
Term
Interval Estimate = point estimate ± margin of error
 Definition
Interval Estimate
Term
Margin of Error = K × standard error
 Definition
Margin of Error
Term
Margin of Error = K × standard error
 Definition
Margin of Error
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