ECO220Y1 Midterm: ECO220Y1Y UTSG Term Test 220 2 DEC15 Solution
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ECO220Y1 Full Course Notes
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December 4, 2015, 9:10 11:00 am (1) ((cid:1842)(cid:3552)(cid:2870) (cid:1842)(cid:3552)(cid:2869)) (cid:1878)(cid:3080)/(cid:2870)(cid:3495)(cid:3017)(cid:3552)(cid:3118)((cid:2869)(cid:2879)(cid:3017)(cid:3552)(cid:3118)) (cid:3041)(cid:3118) +(cid:3017)(cid:3552)(cid:3117)((cid:2869)(cid:2879)(cid:3017)(cid:3552)(cid:3117)) (cid:3041)(cid:3117) (cid:1842)(cid:3552)(cid:2870)= (cid:2876)(cid:2877)(cid:2869)(cid:2875)(cid:2875)=0. 503 and (cid:1842)(cid:3552)(cid:2869)= (cid:2872)(cid:2870)(cid:2869)(cid:2876)(cid:2868)=0. 233 (0. 503 0. 233) 1. 96(cid:3496)0. 503(1 0. 503) We are 95% confident that among all potential non-mobility impaired users of the. 180 elevator posting the electricity message will cause the percent using the stairs to be between 17. 3 and 36. 6 percentage points higher compared to the exercise message. The point estimate of the difference is 26. 9%, which is a big difference in the percent using the stairs depending on the message shown, with a margin of error of 9. 6%. +1 recognizes that the natural log straightens the scatter plot. +3 correctly interprets the two ols slopes and is context-specific (e. g. speaking about china during the relevant time period) +2 correctly interprets the r2 (noting how high it is) +1 correctly notes that the ols intercepts have no interpretation in this case (far outside range of the data)
