Formula Sheet.pdf - Equations Calculating Probabilities...

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Equations Calculating Probabilities z=(x-μ)/σ Mean (μ) Standard dev (σ) Value of interest (x) Z score = Used to calc probability over a range form the standard normal dist Calculating Ranges X=μ +zσ Standard Error σ=σx OR σx = σ/ 𝑛 𝑛 σx = standard error σ= population distribution sd = observations in example 𝑛 X bar= sample mean μ = tru population mean σx = standard error Estimate T distribution
S=sd of data from sample Converts to same scale Calculating Standard Error SE =s/ 𝑛 SE= standard error S = sample standard deviation n is the sample size CI= mean tC x SE ± tC= critical-score SE= standard error Confidence Intervals

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