The following data relates to air pollution in 41 cities.

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Assignment 4

The following data relates to air pollution in 41 cities. There is a single dependent variable, the annual mean concentration of Sulphur dioxide, in micrograms per cubic meter. These data generally relate to means for the three years, 1969-71. The values for six explanatory variables are also provided, two of which relate to human ecology, and four to climate.

The variables are as follows:

SO2 content of air in micrograms per cubic meter

Average annual temperature in °F

Numbering of manufacturing enterprises employing 20 or more workers

Population size (1970-census); in thousands

Y

X1

X2

X4

Average annual wind speed in miles per hour

Xs

Average annual precipitation

X6

Average number of days with precipitation per year

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