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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

Calculator allowed

The aim is to predict waste collected from event attendance. Use technology with the data below

event attendance (hundreds of people)waste collected (kg)
71311
74319
76313
79321
81323
84321
86331
89329
Scatterplot with 8 points. The horizontal axis is event attendance (hundreds of people) and the vertical axis is waste collected (kg). The observed event attendance values run from 71 to 89, and the observed waste collected values run from 311 to 331. The plotted response values generally increase as the explanatory values increase.708090310315320325330event attendance(hundreds of people)waste collected (kg)
(a)1 mark

Select the explanatory variable to enter as x

(b)2 marks

Use technology to calculate the least-squares intercept a and slope b. Give both values to 2 decimal places

Use the form: predicted waste collected = a + b × event attendance