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Lecture24[1] - Lecture 24 Normal Distribution Section 6.2...

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Normal Distribution Section 6.2 1 STAT 225, Dallas Bateman, Spring 2010 Lecture 24
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Normal Distribution The normal distribution is by far the most important distribution that we will study. It is the distribution used most in “daily life” to model real world situation. It was first used by Carl Friedrich Gauss, so it is sometimes called the Gaussian distribution.
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Normal Distribution The normal distribution is a symmetric distribution that is centered around a mean and spreads out in both directions. In other words, most people or objects tend to center around a certain value, but there are some higher values and some lower values.
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Normal Distribution Examples : Test scores for all STAT 225 courses. Height of 2000 male football players Sales receipts for 1000 customers at a grocery store.
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Normal Distribution Notation: is the mean of the data is the variance of the data PDF: CDF: 2 ~ ( , ) X N   2 2 1 ( ) ( ) exp for 2 2 x f x x  
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