The table below lists measured amounts (mg) of tar, carbon monoxide (CO), and nicotine in king size cigarettes of different brands (from Data Set 13 "Cigarette Contents" in Appendix B).
a. Is there is sufficient evidence to support a claim of a linear correlation between tar and nicotine?
b. What percentage of the variation in nicotine can be explained by the linear correlation between nicotine and tar?
c. Letting y represent the amount of nicotine and letting x represent the amount of tar, identify the regression equation.

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Tar CO Nicotine1.5 27 16 1.7 24 16 1.6 20 16 1.0 21 14 1.2 25 20 16 1.1 20 16 1.1 24 17 1.4 18