The speed (in kilometers per hour) and mileage (in kilometers per liter) of $13\text{ cars}$ 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

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