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Unformatted text preview: measure metabolic rates in calories, both the mean and the standard deviation s are also in calories. This is one reason to prefer s to the variance s2, which is in squared calories. * Like the mean, s is not resistant. A few outliers can make s very large. The five-number summary is usually better than the mean and standard deviation for describing a skewed distribution or a distribution with strong outliers. Use and s only for reasonably symmetric distributions that are free of outliers. A graph gives the best overall picture of a distribution. Numerical measures of center and spread report specific facts about a distribution, but they do not describe its entire shape. Numerical summaries do not disclose the presence of multiple peaks or clusters. This symbol for population standard deviation is (o ? ? ? ? ? ) which is pronounced "sigma". "s" is the symbol for sample standard deviation....
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This note was uploaded on 02/27/2012 for the course STAT 121 taught by Professor Patticolling during the Winter '11 term at BYU.
- Winter '11
- Standard Deviation