Regression was done to predict the amount of electricity used (in kilowatt-hours) from size of 135 homes (in square feet). The least squares regression model is usage= 1298 + .4(size). Explain what the slope of the line says about the electricity usage and home size.
1. On average, the amount of electricity used increases by 0.4 kilowatt-hours when the size of the house is increased by a square foot.
2. On average, the amount of electricity used increases by 1298 kilowatt-hours when the size of the house is increased by a square foot.
3. On average, the size of the house increases by .4 feet for every kilowatt-hour used.
4. On average, the amount of electricity used is .4 kilowatt hours less than the size of the house.
5. On average, the size of the house increases by 1298 feet for every kilowatt-hour used.
