Need help with C bolded

Fitting a straight line to a set of data yields the following prediction line. Complete(a) through(c) below.

Yi=150.2Xi

a. Interpret the meaning of theY-intercept, b0. Choose the correct answer below.

A.

TheY-intercept, b0=15, implies that when the value of X is0, the mean value of Y is 15.

Your answer is correct.

B.

TheY-intercept, b0=0.2, implies that when the value of X is0, the mean value of Y is 0.2.

C.

TheY-intercept, b0=15, implies that for each increase of 1 unit inX, the value of Y is expected to increase by 15 units.

D.

TheY-intercept, b0=15, implies that the average value of Y is 15.

b. Interpret the meaning of theslope, b1. Choose the correct answer below.

A.

Theslope, b1=0.2, implies that the average value of Y is 0.2.

B.

Theslope, b1=0.2, implies that for each increase of 1 unit inX, the value of Y is expected to increase by 0.2 units.

C.

Theslope, b1=0.2, implies that for each increase of 1 unit inX, the value of Y is estimated to decrease by 0.2 units.

Your answer is correct.

D.

Theslope, b1=15, implies that for each increase of 1 unit inX, the value of Y is expected to increase by 15 units.

c. Predict the mean value of Y for X=7.

Yi=

(use integer or adecimal.)