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Measures of Central Tendency

Measures of Dispersion

Permutation (Order matters)

nPr = n! / (n-r)!

Combination (Order doesn't matter)

nCr = n! / [r!(n-r)!]

P(A or B)P(A) + P(B) - P(A and B)

P(A and B) [Independent]P(A) · P(B)

P(A|B) [Conditional]P(A and B) / P(B)

Binomial

P(x) = nCx pˣ(1-p)ⁿ⁻ˣ

Normal

z = (x - μ) / σ

Poisson

P(x) = (e⁻ᵎ · λˣ) / x!

Confidence Intervals

Mean (Known σ):

x̄ ± Z(σ/√n)

Mean (Unknown σ):

x̄ ± t(s/√n)

Linear Regression

ŷ = b₀ + b₁x

Chi-Square Statistic:

χ² = Σ (O - E)² / E

Preparing your Lab

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