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Unformatted text preview: o Tally observations into appropriate classes o Total the frequency for each class o Calculate the relative frequency for each class T Histogram o Vertical bar chart that are constructed at the boundaries of each class o Bars are the same width o Joined at the class boundaries o Height represents the frequency or the relative frequency of each category T Five-Number Summary o Minimum value of an ordered data set o Q 1 = upper boundary of first quarter of data – quartile one o Median = middle value of ordered data – quartile two o Q 3 = upper boundary of third quarter of data – quartile tree X min 2.37 Q 1 2.72 Median 3.11 Q 3 3.52 X max 4.00 T Box plot o If extreme outlying values exist, they can be graphed as separate points beyond the ends of the whiskers that extend to the lowest and highest values that are not outliers. Range = x max – x min IQR = Q3 – Q1 (just the box length)...
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- Fall '08
- Statistics, Interquartile range, Histogram, Summary statistics