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# 072 - Summarizing Data 9:02:00 AM Frequency Distribution It...

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Summarizing Data 11/09/2007 09:02:00 Frequency Distribution It is a table that divides the numbers into categories Histogram A graphical distribution of frequencies Stem-and-leaf display (stemplot) There is one number for every dataset Retains the original data (at least the most important digits) Puts the data in order Shapes of datasets Symmetric o One side is a “mirror” reflection of the other o The mean is approximately equal to the medium Skewed to the right (or positively skewed): ex) age of classmates o Higher value are more spread out than lower values o Most values are moderate or small: a few values are very large o The mean is larger than the median Skewed to the left (or negatively skewed): ex) scores on easy test o Lower values are more spread out than higher values o

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