The table below shows the number of cars (in millions) sold in the United States for various years and the percent of those cars manufactured by GM.

Year	Cars Sold (millions)		Percent GM		Year	Cars Sold (millions)		Percent GM
1950	6.0		50.2		1985	15.4		40.1
1955	7.8		50.4		1990	13.5		36.0
1960	7.3		44.0		1995	15.5		31.7
1965	10.3		49.9		2000	17.4		28.6
1970	10.1		39.5		2005	16.9		26.9
1975	10.8		43.1		2010	11.6		19.1
1980	11.5		44.0		2015	17.5		17.6

Requirements 

Determine the correlation coefficient between the two variables

State the decision rule for 0.01 significance level: H₀: ρ ≥ 0; H₁: ρ < 0. Reject H0 if t