12-13-12_Ch.2_Day_2_emprical_rulez-scorestableA

# 12-13-12_Ch.2_Day_2_emprical_rulez-scorestableA - Ch.2...

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Empirical Rule (68­95­99.7 Rule) Review Ch.2 Sections 2.1 & 2.2 Normal Distributions Ex. The distribution of SAT Verbal scores is approximately normal with mean 600 and standard deviation 65. a) What percent of scores are between 470 and 730? b) What percent of scores are less than 535? c) What percent of scores are between 535 and 795? d) What percent of scores are less than 500? Standard Score (standardized score or z-score) z = standardized score - "measures the number of standard deviations the observation is from the mean" μ = true mean σ = true standard deviation x = actual score/observation Standard Normal Distribution - The normal distribution (z-distribution) with mean 0 and standard deviation 1; N(0,1).

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TABLE A (front cover of your book and part of your formula sheet packet) Ex. What percent of test takers score lower than 500 on the SAT Verbal? [Remember N(600,65)]
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