The ages(in years) and the numbers of hours of sleep in one night for seven adults..

Age,x	35	20	59	42	68	38	75
Hours of sleep,y	7	9	5	6	5	8	4

1. Calculate the correlation coefficient r.
2. Is the correlation coefficient significant? Use = 0.01
3. Find the equation of the regression line for the data.
4. Use the regression equation to predict value of hours of sleep when the age is x=50
5. At = 0.05 is there enough evidence to conclude that there is a significant correlation between age and hours of sleep?