Regressionwas used to estimate annual electricity cost ($000) per house and number of solar panels per house.

Estimated Electricity cost = 3.48 - 0.25 Solar panels

Which of the following is the correct interpretation of the slope?

The annual electricity cost decreases by exactly $0.25 per annum.

Estimate, for each extra solar panel installed in a house, the annual electricity cost decreases by an average of $0.25 per annum.

The annual electricity cost decreases by exactly $250 per annum.

Estimate, for each extra house,the number of solar panelsdecreases by 0.25 per annum.

Estimate, for each extra solar panel installed in a house, the annual electricity cost decreases by an average of $250 per annum.