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Unformatted text preview: CHAPTER 3 SUMMARY • We can sometimes describe the overall pattern of a distribution by a density curve . A density curve has total area 1 underneath it. An area under a density curve gives the proportion of observations that fall in a range of values. • A density curve is an idealized description of the overall pattern of a distribution that smooths out the irregularities in the actual data. We write the mean of a density curve as μ and the standard deviation of a density curve as σ to distinguish them from the mean and standard deviation s of the actual data. • The mean , the median , and the quartiles of a density curve can be located by eye. The mean μ is the balance point of the curve. The median divides the area under the curve in half. The quartiles and the median divide the area under the...
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This document was uploaded on 11/02/2011 for the course MATH ma 116 at Montgomery.
 Fall '11
 

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