If we wanted to a regression analysis for:

Units Sold (#)

Maintenance Cost ($)

Utility Cost ($)

1- is it a multiple regression using units sold as X range since X can have one value type? and the costs in Y range

2-Or do each of them take a separate analysis with Units in Y and The cost in X?

3- or the opposite (switching X & Y)

4-I did a multiple regression and the intercept was negative, how come?

if you need more info i have the whole question (Project long) but I just put the relevant info

Data:

Shirts Sold 1800 2110 2630 3250 5000 5300 3920 2090 8000 6810 6020 8700

Maintenance Cost $1,620.00 1,720.00 1,740.00 1,780.00 1,912.00 1,966.00 1,805.00 1,705.00 2,120.00 2,030.00 2,014.00 2,240.00

Utility Cost $1,100.00 1,158.00 1,161.00 1,211.00 1,485.00 1,502.00 1,278.00 1,117.00 1,688.00 1,630.00 1,498.00 1,740.00