The following data show dollar value of sales with corresponding adventising levels for a small retail chain in Philadelphia.
Advertising:$584 $386 $452 $635 $242 $328 $517
sales:$6445 $4015 $4822 $7017 $2848 $3888 $5554
e) Test whether a linear relationship exists between advertising and sales
f) Find the approximate p-value for the test statistics
g) Find the upper bound of a 95% confidence interval for the increase in the amount of sales per extra dollar in advertising.( to nearest $)