ECON1151 Study Guide - Dno, Covariance, Ogive
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[ rg= xg 1=0. 046=4. 6 : r = annual growth rate, t = number of years = n, y = % yielded over t years (1+r)t=(1+ y) xg=(1+r)=(1+ y) Pth percentile=value located the ( p/100) (n+1)thordered position: quartiles. Why we use variance both range and iqr only take into account two of the data values when measuring the spread of the data: variance gives a measure of the spread that takes into account each data value"s deviation from the mean, why not simply take the average of all deviations? (cid:224) this would always equal zero because the mean is the center of the data (xi x)=0 i. N i =1 (xi )2 n s2= 1 (n 1) i=1 (xi x)2: alternate formulas for population variance and use. [ k ] is : works for any population (regardless of its distribution) with mean , standard deviation , and.
