LectureAug27%20(Wed)

LectureAug27%20(Wed) - Descriptive Statistics I. What Can...

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Unformatted text preview: 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 Interval Data Categorical Data BME 423 Lecture Notes - Aug. 27, 2008 II. Population Statistics 1 1 N i i x N = = ( ) 2 2 1 1 N i i x N = = Dispersion - Variance Central Tendency - Mean , 1 , , i x i N = 40. 5.0 cm cm = = 15 2.5 cm cm = = 2 1 1 ( ) exp 2 2 x f x = Normal (Gaussian) Distribution Probability density function for Normal distributed random variable f ( x ) x Normally distributed random variable Non Normal Distribution II. Estimates from a Limited Sample Sample Statistics 1 1 n i i x x n = = ( ) 2 2 1 1 1 n i i s x x n = = Dispersion Sample Variance Central Tendency Sample Mean , 1 , , i x i n n N = < 10 15 20 Dispersion Range...
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LectureAug27%20(Wed) - Descriptive Statistics I. What Can...

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