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Unformatted text preview: Descriptive Statistics (Continued) BME 423 HR Statistics Some Basic Probability Probability and Random Variables • Discrete RV • Continuous RV Discrete Random Variables • Probability Density (Mass) Function • Cumulative Distribution Function • Expected Value BME 423 Lecture Notes  Sept. 3, 2008 Height of Martians – The Population 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 = = HR of BME 423 Students – The Population 66 73.5 beats/min =13.6 beats/min median 72.0 beats/min range [42, 124] 25 % 64. beats/min 75 % 80. beats/min N th th μ σ = = = = = = 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 0.0 2.5 5.0 7.5 10.0 12.5 15.0 17.5 HR (Beats/min) Number Height of Martians – A Sample 1 1 41.5 3.8 x s = = 2 2 36. 5. x s = = 3 3 40. 5. x s = = 40. cm 5.0 cm μ σ = = is an estimateof x μ is an estimateof s σ " N=10 , 1 , , i x i n = … Given a sample of size n: 1 1 n i i x x n = = ∑ Sample mean: ( ) 2 2 1 1 1 n i...
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This note was uploaded on 12/02/2008 for the course BME 423 taught by Professor D'argenio during the Fall '06 term at USC.
 Fall '06
 D'Argenio
 Biomedical Engineering

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