Lesson 5 - Class 4 Stat113 Click to edit Master subtitle...

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Click to edit Master subtitle style 2/16/11 Class 4 Stat113

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2/16/11 Review Density Curve: A mathematical model of the distribution of a variable Approximates a histogram Given actual data for a variable X, one can: View a histogram of X Answer questions about the distribution of X precisely
2/16/11 Normal Distribution Different ways to say the same thing: A variable X is distributed normally A variable X follows a normal distribution A variable X is normal A variable X is normally distributed This distribution is represented graphically as a normal density curve

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2/16/11 Normal Density Properties Unimodal Symmetric For each mean, std. dev. pair (µ, σ) We have a different normal density curve The center of the curve is at µ The size of σ relative to µ tells how flat
2/16/11 Different Normal Densities Picture from The blue, red, and yellow normal curves are all centered at µ = 0, But have values for σ (the standard deviation) Note that here the values for σ2, or the variance , are given

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This note was uploaded on 02/15/2011 for the course STATISTICS 113 taught by Professor Cassidy during the Fall '10 term at CUNY Hunter.

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Lesson 5 - Class 4 Stat113 Click to edit Master subtitle...

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