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1 of 8 0-day streak

Compute r and the least-squares line from data

DIFFICULTYintrostandardchallengeexam
QUESTION TYPEMix of allChange
Equation; strong positive; EV firstEquation; strong negative; EV firstNOWMix of allRecommended
Question 1 of 8

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Treat rainfall as the explanatory variable for stream inflow. Use technology to analyse the data

rainfall (mm)stream inflow (ML)
31172
33171
35200
37217
39225
41224
43211
45228
Scatterplot with 8 points. The horizontal axis is rainfall (mm) and the vertical axis is stream inflow (ML). The observed rainfall values run from 31 to 45, and the observed stream inflow values run from 171 to 228. The plotted response values generally increase as the explanatory values increase.30354045180200220rainfall (mm)stream inflow (ML)
(a)1 mark

Which table variable belongs in the x-list?

(b)2 marks

Determine the least-squares parameters when rainfall is x. Give both values to 2 decimal places

Use the form: predicted stream inflow = a + b × rainfall