A Store Manager Wants to Know the Demand Y for an Energy

Multiple Choice

A store manager wants to know the demand y for an energy bar as a function of price x. The daily sales for three different prices of the energy bar are shown in the table. Price, x
$ 1.02
$ 1.23
$ 1.54
Demand, y
410
365
280
(i) Use the regression capabilities of a graphing utility to find the least squares regression line for the data.
(ii) Use the model to estimate the demand when the price is $1.38.

A) (i) $y = - 24.314583 x + 382.38409$ ; (ii) 348.708392
B) (i) $y = - 24.314583 x + 382.38409$ ; (ii) -416.059787
C) (i) $y = 382.38409 x - 24.314583$ ; (ii) 505.287381
D) (i) $y = - 24.314583 x - 382.38409$ ; (ii) -416.059787
E) none of the above