# 1.2 - complete description of center and spread Used most...

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AP Statistics Chapter 1 1.2 The most common measure of center is the ordinary arithmetic average, or mean. The mean is nonresistant because it is sensitive to the influence of extreme observations. Another natural idea is to use the “middle value” in a histogram or stemplot (the median). The median is resistant to extreme observations. There are three quartiles in an observation. Only use quartiles when you choose the median as the center of the distribution. Quartiles are also esistant to extreme observations. The five number summary is the minimum the 1 st quartile the median the 3 rd quartile and the maximum. Giving these numbers offers a reasonably
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Unformatted text preview: complete description of center and spread. Used most often with describing skewed distributions. A modified boxplot plots outliers as isolated points. The variance is the standard deviation squared. The standard deviation is the square root of the variance. The standard deviation is the most what is used most commonly for describing distribution. It is looking at how far the observations are from their mean. If the standard deviation=0 that means there is no spread. S cannot be a negative number. It is strongly influenced by extreme observations....
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