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Find the equation of a line fitted to a scatterplot

DIFFICULTYintrostandardchallengeexam
Question 1 of 8

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Use floor area as the explanatory variable for quarterly electricity use

Scatterplot with 10 points. The horizontal axis is floor area (m²) and the vertical axis is quarterly electricity use (kWh). The observed values of floor area run from 124 to 142, and the observed values of quarterly electricity use run from 795 to 814. The points rise from left to right around a straight path, with small departures from that path. A fitted line is drawn through the on-line anchors (131, 803) and (135, 807).130140795800805810815floor area (m²)quarterly electricityuse (kWh)

The fitted line passes through the on-line anchors (131, 803) and (135, 807)

(a)1 mark

Use rise divided by run to determine the line's slope

(b)1 mark

Find the off-screen intercept from the fitted line's equation

(c)1 mark

Choose the model with the response variable on the left