what is the value of x_1 what is the average SOD what's the value of the variables in the hline how much is the so2 concentration what is the value of the variable for so what is the variable so2$ what is the coefficient of the variable x_2 what would the so2 concentration be in a saturday is the average temperature affected by the saturdays what is the variable for the concentration of sulfur dioxide in a sample? how to find sulfur dioxide concentration is there a special effect on weekend weather? which model has a special effect on sulphur dioxide concentration when is the sulphur dioxide concentration greatest how to determine the average concentration of sulfur dioxide why is it so low on weekends what is the sulfon dioxide concentration what is the sulf dioxide concentration what is the mean of the temperature for sulfur when was the sulfur dioxide concentration measured