ECON2209 Lecture 2: 20January_EconStats_karagodsky

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12 May 2017
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Xj + 1 = (x1 + 1) + (x2 + 1) + (x3 + 1) = (x1 + x2 + x3) + (1 + 1 + 1) Lastly, we can also separate summations like this: P3 i=1 xi n this is also called xbar, or the sample average. The issue is with separating the rst term. Products of terms with i (nonconstants) must stick together; however k can be factored out because it is a constant. X i=1 (x2 i yi + kxi + m) = n. With enough sampling, your outcome will converge to the mean. There is a tendency of a data series to gravitate towards the center of distribution (coin toss) There are several ways of writing the mean, here are some: The variance of a population is given by the following equation: X = population mean (not always equal to the sample mean)

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