Formula Sheet and List of Symbols, Basic Statistical Inference
Formula Sheet and List of Symbols, Basic Statistical Inference
Symbol What it Represents
X variable
[pic] sample mean
μ population mean
s sample standard deviation
s2 sample variance
σ population standard deviation
σ2 population variance
sample proportion
p population proportion
q 1-p
n sample size
α significance level
SE standard error (σ of a sampling distribution)
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For problems for means:
(large n)
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For problems for means:
(small n)
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[pic]
For problems for proportions:
For calculating required sample size: Let ∀E be the allowable error for the 95% confidence interval when estimating p or μ. The required sample size to estimate p or μ, respectively, is ...
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