Brand  Tar  Nicotine  CO
American_Filter  16  1.2  15
Benson_&_Hedges  16  1.2  15
Camel  16  1  17
Capri  9  0.8  6
Carlton  1  0.1  1
Cartier_Vendome  8  0.8  8
Chelsea  10  0.8  10
GPC_Approved  16  1  17
Hi-Lite  14  1  13
Kent  13  1  13
Lucky_Strike  13  1.1  13
Malibu  15  1.2  15
Marlboro  16  1.2  15
Merit  9  0.7  11
Newport_Stripe  11  0.9  15
Now  2  0.2  3
Old_Gold  18  1.4  18
Pall_Mall  15  1.2  15
Players  13  1.1  12
Raleigh  15  1  16
Richland  17  1.3  16
Rite  9  0.8  10
Silva_Thins  12  1  10
Tareyton  14  1  17
Triumph  5  0.5  7
True  6  0.6  7
Vantage  8  0.7  11
Viceroy  18  1.4  15
Winston  16  1.1  18
a) Find the regression equation that expresses the responsevariable​ (y) of nicotine amount in terms of the predictorvariable​ (x) of the tar amount.
​b) Find the regression equation that expresses the responsevariable​ (y) of nicotine amount in terms of the predictorvariable​ (x) of the carbon monoxide amount.
​c) Find the regression equation that expresses the responsevariable​ (y) of nicotine amount in terms of predictor variables​(x) of tar amount and carbon monoxide amount.
​d) For the regression equations found in parts​ (a), (b), and​(c), which is the best equation for predicting the nicotine​amount? Justify your answer.
​e) Is the best regression equation identified in part​ (d) agood equation for predicting the nicotine​ amount? Why or why​not?
