Create the data set CITYTEMP. CITYTEMP contains the average monthly temperatures for three cities.
data citytemp; input Month Fahrenheit City $ @@; datalines; 1 40.5 Raleigh 1 12.2 Minn 1 52.1 Phoenix 2 42.2 Raleigh 2 16.5 Minn 2 55.1 Phoenix 3 49.2 Raleigh 3 28.3 Minn 3 59.7 Phoenix 4 59.5 Raleigh 4 45.1 Minn 4 67.7 Phoenix 5 67.4 Raleigh 5 57.1 Minn 5 76.3 Phoenix 6 74.4 Raleigh 6 66.9 Minn 6 84.6 Phoenix 7 77.5 Raleigh 7 71.9 Minn 7 91.2 Phoenix 8 76.5 Raleigh 8 70.2 Minn 8 89.1 Phoenix 9 70.6 Raleigh 9 60.0 Minn 9 83.8 Phoenix 10 60.2 Raleigh 10 50.0 Minn 10 72.2 Phoenix 11 50.0 Raleigh 11 32.4 Minn 11 59.8 Phoenix 12 41.2 Raleigh 12 18.6 Minn 12 52.5 Phoenix ;