LectureAug26

# LectureAug26 - 1 Descriptive Statistics I What Can...

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Unformatted text preview: 1 Descriptive Statistics I. What Can Statistical Procedures Tell Us? II. Population Statistics • Central Tendency • Dispersion • Normal Distribution III. Estimates from a Limited Sample • Sample Statistics • How Good are These Estimates? • Standard Error of the Mean IV. Classification of Data V. BME 423 HR • Interval Data • Categorical Data BME 423 Lecture Notes - Aug. 26, 2009 Reading : Chapt.1 & 2 II. Population Statistics 1 1 N i i x N μ = = ∑ ( ) 2 2 1 1 N i i x N σ μ = = − ∑ Dispersion - Variance Central Tendency - Mean , 1 , , i x i N = … 40. 5.0 cm cm μ σ = = 15 2.5 cm cm μ σ = = 2 2 1 1 ( ) exp 2 2 x f x μ σ σ π ⎡ ⎤ − ⎛ ⎞ = − ⎢ ⎥ ⎜ ⎟ ⎝ ⎠ ⎢ ⎥ ⎣ ⎦ Normal (Gaussian) Distribution Probability density function for Normal distributed random variable f ( x ) x μ Normally distributed random variable (Income) 3 Non Normal Distribution II. Estimates from a Limited Sample – Sample Statistics 1 1 n i i x x n = = ∑ ( ) 2...
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## This note was uploaded on 10/13/2009 for the course BME 423 at USC.

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LectureAug26 - 1 Descriptive Statistics I What Can...

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