MATH 141 - Equation Sheet

MATH 141 - Equation Sheet - QUANTITATIVE DATA 1. Dot plots...

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Unformatted text preview: QUANTITATIVE DATA 1. Dot plots 2. Stem-and-leaf displays 3. Histograms SUMMATION NOTATION Data = { 1, 1, 2, 3, 5 } 1. x = 1 + 1 + 2 + 3 + 5 = 12 2. x 2 = 1 2 + 1 2 + 2 2 + 3 2 + 5 2 = 1 + 1 + 4 + 9 + 25 = 40 3. ( x ) 2 = (1 + 1 + 2 + 3 + 5) 2 = (12) 2 = 144 4. ( x-1) = (1-1) + (1-1) + (2-1) + (3-1) + (5-1) = 0 + 0 + 1 + 2 + 4 = 7 SAMPLE MEAN x = x / n REL. FREQ. = freq. / N MEDIAN Value of the middle number in an ordered set of quantitative data (or the mean of the two middle numbers if the set has an even number of values). MODE: The value that occurs most often in a set of quantitative data. MODAL CLASS: The class in which the mode lies. (Usually the mode is centered in the modal class.) SKEWNESS The tendency of the distribution to have elongated tails. If the mean is higher than the median, the set is skewed rightward, for example. If mean is lower than median, set is skewed leftward....
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