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Qxp 121008 357 pm page 2 triola statistics series

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Unformatted text preview: nt (predictor, explanatory) variable Dependent (response) variable Slope of regression line QXP6326677.qxp 12/10/08 3:57 PM Page 2 Triola Statistics Series Review Regression N Regression Equation: y = b0 + b1x x: Multiple Regression Procedure: Obtain results using computer or calculator. Multiple Regression Equation: N y = b0 + b1x1 + b2x2 + Á + bk xk n: Sample size k: Number of independent (x) variables Important factors to consider: P-value (from computer display) and adjusted R2, where adj. R2 = 1 1n - 12 3n - 1k + 124 11 - R22 McNemar’s Test Use for a 2 * 2 frequency table from matched pairs. Requirement: b + c Ú 10, where b and c are frequencies from discordant pairs. Test is right-tailed with test statistic x2 = 1 ƒ b - c ƒ 2 - 122 b+c Nonparametric Methods Nonparametric (distribution-free) tests: Do not require assumptions about the population distributions. Rank: Number assigned to a sample value according to its order in the sorted list. Lowest value has rank 1, 2nd lowest has rank 2, and so on. Sign Test: Uses plus/minus signs instead...
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