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**Unformatted text preview: **frequency Range Frequency Cumula1ve Frequency 0- 3 5 5 4- 6 6 11 7- 9 1 12 et cetera 5 + 6 5 + 6 + 1 Stem and Leaf The data 90, 96 83, 85, 87, et cetera 1, 2, 4 (n = 3) • Sample mean: (1+2+4)/3 = 7/3 • Sample median: 2 • Sample variance: (4/3*4/3 + 1/3*1/3 + 5/7*5/7)/(3- 1) = 3/7 • Sample standard deviaBon: sqrt(3/7) Measures of “central tendency” • Mean: balancing point • Median: middle value(s) Measure of “spread” • Variance: (almost) the mean (center of) squared “deviaBons” from the mean. • Standard deviaBon: square root of squared deviaBons… typo: should be equal...

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