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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)
54387
57386
59394
62393
64395
67402
69398
72405
Scatterplot with 8 points. The horizontal axis is rainfall (mm) and the vertical axis is stream inflow (ML). The observed rainfall values run from 54 to 72, and the observed stream inflow values run from 386 to 405. The plotted response values generally increase as the explanatory values increase.6070385390395400405rainfall (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