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# Slope Meaning

APSTAT-VDPKAK

The speed (in kilometers per hour) and mileage (in kilometers per liter) of $13$ cars was measured. The regression equation is as follows:

$$\text{Mileage (km per liter)}= -1.8 + 0.536 \times \text{Speed (km per hour)}$$

Predictor Coef SE Coef T P
Constant -1.8 8.357 -0.22 0.8333
Kilometers per hour 0.536 0.1192 4.5 0.001

According to this model, an increase in speed of $10$ kilometers per hour would change the fuel economy by

A

An increase of $5.36$ kilometers per liter.

B

A decrease of $5.36$ kilometers per liter.

C

A decrease of $1.8$ kilometers per liter.

D

An increase of $0.536$ kilometers per liter.

E

An increase in $8.357$ kilometers per liter.