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Statistics Cheat Sheet. Population. The entire group one desires information
about. Sample. A subset of the population taken because the entire population is
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Statistics formula sheet. Summarising data. Sample mean: x = 1 n n. ∑ i=1 xi.
Sample variance: s2 x = 1 n − 1 n. ∑ i=1. (xi − x)2 = 1 n − 1. ( n. ∑ i=1 x2 i − nx2).
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σ. √ n. • Sample size for estimating µ: n. ( zα/2 · σ. E. )2. , rounded up to the
nearest whole number. ELEMENTARY STATISTICS, 5/E. Neil A. Weiss.