ECO220Y1 Midterm: ECO220Y1Y UTSG Term Test 220 2 NOV17 Solution
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ECO220Y1 Full Course Notes
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November 17, 2017, 9:10 11:00 am (1) (a) two points determine a line. When y = 10, x 26 and when y = 15, x 54. Using the point slope formula, ((cid:1877) (cid:1877)(cid:2869))=(cid:1865)((cid:1876) (cid:1876)(cid:2869)), where (cid:1865)=(cid:2869)(cid:2873)(cid:2879)(cid:2869)(cid:2868) (cid:2873)(cid:2872)(cid:2879)(cid:2870)(cid:2874) 0. 18, gives ((cid:1877) 10)=0. 18((cid:1876) 26). Rewrite as: (cid:1877)=5. 4+0. 18(cid:1876). (alternatively, you can read the intercept from the provided figure and just do the (cid:1865) calculation to obtain the slope. ) Equation for the ols line: pct_police_fatal_shoot-hat = 5. 4 + 0. 18*int_hom_per_100000. The slope means that in countries with an extra 10 intentional homicides per 100,000 people, on average we observe an extra 1. 8 percentage points of the overall firearm homicides being fatal shootings committed by police. [note that we cannot give a causal interpretation of this ols line obtained from observational data. ] (b) rate_police_fatal_shoot-hat = 0. 054 + 0. 0018*int_hom_per_100000 (c) pct_police_fatal_shoot-hat = 5. 4 + 1. 8*int_hom_per_10000 (2) this is a grouped data question. We must use approximation techniques by selecting a representative value for each possible iclicker response.
