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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 air pressure from elevation. Use technology with the data below

elevation (hundreds of metres)air pressure (hPa)
7943
10946
12932
15935
17927
20900
22898
25871
Scatterplot with 8 points. The horizontal axis is elevation (hundreds of metres) and the vertical axis is air pressure (hPa). The observed elevation values run from 7 to 25, and the observed air pressure values run from 871 to 946. The plotted response values generally decrease as the explanatory values increase.1020880900920940elevation (hundreds ofmetres)air pressure (hPa)
(a)1 mark

Which table variable belongs in the x-list?

(b)2 marks

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

Use the form: predicted air pressure = a + b × elevation