ECN 102 Study Guide - Midterm Guide: Standard Deviation
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Econ 102 (analysis of economic data): cameron spring 2016. 1. (a) the three observations are missing, 2 and 4. (e. g. x1 = 2 in period 1 becomes x2;(cid:0)1 = 2 in period 2). (b) 18 years. At 4% per annum this takes 72=4 = 18 years. (c) (w(cid:0)52)=2 since in general (w (cid:0) (cid:22)w)=s = (w (cid:0) 52)=p4 = (w (cid:0) 52)=2: i=1 (cid:0)2 + 6. 2(cid:1) + (cid:0)2 + 6 i(cid:1) = (cid:0)2 + 6 (d) 46. 1%. The support was 7. 0 percentage points higher (not 7. 0% higher) so we can simply add. 39. 1+7. 0. (e) (cid:1) ln x = (7:29 (cid:0) 7:15) = 0:14. 3(cid:1) = 2 + 6 + 2 + 3 + 2 + 2 = 17: (f ) p3. Mean . 666 " median = . 68 or skewness = (cid:0):17 " 0. 0. (b) 95% lie in approximately (cid:22)x(cid:6) 2(cid:2) s = 0:6663(cid:6) 2(cid:2) 0:1602 = 0:6663(cid:6) 0:3204 = (0:3459, 0:9867):
