A major software company wants to open an office in Canada. Given the demand for skilled computer professionals, this company must provide a competitive living environment. The last criterion to consider is air quality. Air quality index values are presented in Table 1 below.

Table 1. Air quality indexes for Montreal, Ottawa, and Vancouver

\fTable 2. First set of calculations Cities Mean of cities Overall mean X - X ( X; - X)2 Vancouver 15 24.4 -9.40 88.36 Ottawa 23.4 24.4 -1.00 1.00 Montreal 34.8 24.4 10.40 108.16 Sums 73.20 73.20 0.00 197.52 Table 3. Second set of calculations Cities Air quality index Overall mean Xij - X (Xj j - X) 2 Vancouver 22 24.4 -2.40 5.76 Vancouver 11 24.4 -13.40 179.56 Vancouver 6 24.4 -18.40 338.56 Vancouver 21 24.4 -3.40 11.56 Vancouver 15 24.4 -9.40 88.36 Ottawa 33 24.4 8.60 73.96 Ottawa 14 24.4 -10.40 108.16 Ottawa 23 24.4 -1.40 1.96 Ottawa 13 24.4 -11.40 129.96 Ottawa 34 24.4 9.60 92.16 Montreal 35 24.4 10.60 112.36 Montreal 37 24.4 12.60 158.76 Montreal 40 24.4 15.60 243.36 Montreal 37 24.4 12.60 158.76 Montreal 25 24.4 0.60 0.36 Sums 366 366 0.00 1,703.60