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?

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.

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.

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