# n_0521 - Chapter 4 Section 4.3 &4.4 Density Curves Density...

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Chapter 4 Section 4.3 &4.4

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Density Curves Density curves are mathematical equations that describe common shapes of data distributions; i.e. the bell curve The area under a density curve is ALWAYS equal to one The area under the curve and above any range of values is the proportion of all observations that fall in that range.
Bell-Shaped Distribution

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Normal distributions If the density curves are symmetric, single- peaked, and bell-shaped, it is called Normal curves, and it describes Normal distribution. Normal distribution is described by its mean and standard deviation.
Chapter 4 Section 4.3 &4.4

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The 68-95-99.7 rule
Example: Suppose adult heights have a normal distribution with μ = 68 inches and σ = 4 inches 68% of adults will be between which two values?

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## This note was uploaded on 02/27/2008 for the course BCOR 1020 taught by Professor Liang,fang during the Summer '07 term at Colorado.

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n_0521 - Chapter 4 Section 4.3 &4.4 Density Curves Density...

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