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Title: stats 2

Essay Details:

Subject: Miscellaneous

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Date: October 6, 2015

Level: University

Grade: A

Length: 4 / 1059

Essay text:

There is no significant difference in the weights of both cities. Manual Pooled P-hat = (192 + 97) / (1342 + 720) = 289 / 2062 = 0.140155 Z-stat = (0.143070 ? 0.134722) ? 0 / sqrt[(0.140155) x (1-0.140155) x (1/1342) x(1/720)] = 0.008348 / 0.016037 = 0.520546 b) Confidence Interval = (p1 ? p2) +/- Za/2 * [sqrt ((p1(1-p1)/n1) + p2(1-p2)/n2)] = (0.143070 ? 0.134722) +/- 1.645 * [sqrt(0.14307(1-0.14307)/1342) + 0.134722(1-0.134722)/720) = 0.008348 +/- 0.026179 Therefore this equals the interval of (-0.0178288, 0.0345244) The confidence interval calculated above is consistent with the conclusion in question A...

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