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Unformatted text preview: | Mean = 5.375 million o Measure of spread Range = max min IQR = Q(0.75) Q(0.5) Middle 50% of data The sample variation s 2 = sigma(xi x-bar, 1 n) 2 /(n-1) The sample standard deviation is s = sqrt(s 2 ) Chebychevs Theorem o For any positive real number k, the fraction of the sample that are between x-bar ks and x-bar + ks is at least 1 1/k 2 A statistic is a function of a sample A theoretical distribution of population is determined by its class and some constant called a parameter Mean of a finite population o = sigma(xi, 1 n)/n o 2 = sigma((xi ) 2 , 1 n)/n...
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- Fall '07