According to basic economics, as the demand for a product increases, the price will decrease. Listed below is the number of units demanded and the price:

Demand	Price
2	$120
5	90
8	80
12	70
16	50
21	45
27	31
35	30
45	25
60	21

a. Determine the correlation between price and demand. Plot the data in a scatter diagram. Does the relationship seem to be linear?
b. Determine the standard error of estimate.