Numbeo.com lists the cost of living (COL) for many cities around the world. These rankings scale New York City as 100, and express the cost of living in other cities as a percentage of the New York cost. For example, the table below shows 25 of the most expensive cities in the world, and indicates that the cost of living in Paris was 30.3% higher than New York in 2010, but only 25.0% higher in 2013.
a) Using the scatterplot below, describe the association between costs of living in 2010 and 2013.
b) The correlation is 0.714. Find and interpret the value of R2.
c) The regression equation predicting the 2013 cost of living from the 2010 figure is COL 2013 = -38.292 + 1.319 COL 2010. Use this equation to find the residual for Oslo.
d) Explain what the residual means.

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COL 2013 COL 2010 Oslo 170.04 152.85 Copenhagen 1249 13891 Zurich Paris Geneva Milan Dublin Brussels London Berlin Lyon Helsinki Tampere Amsterdam 107.61 111.3 Stockholm Oxford Tampa Munich Sydney 166.51 132.03 125.02 130.3 156.17 122.69 106.12 122.58 121.5 120.79 111.55 120 116.06 118.47 86.65 115.24 104.08 115.04 111.76 113.91 109.04 111.96 126.96 111.02 109.15 110.15 81.32 109.64 105.01 107.96 139.25 104.83 99.5 103.88 88.27 103.67 7777 100.99 105.24 100.36 91.79 100.33 100 Madrid Atlanta Edmonton Seattle New York 100 160t 140 120 10어 80 1 100 110 20 130 140 150 COL 2010