Forming a linear model from a given set of data test questions - National 5 Maths Revision

1

Alex has an IQ of 118. Use the line of best fit on the diagram to estimate Alex's mark in the general knowledge test.

Scatter graph diagram with line of best fit

12

13

14

2

Sheena scored 17 in the general knowledge test. Use the line of best fit on the diagram to estimate Sheena's IQ.

122

123

124

3

Ahmed scored 16 in the Maths test but missed the Science test. Use the equation of the line of best fit to obtain an approximate score for Ahmed in the Science test.

Diagram of scatter graph with equation y = 1/2x + 10

18

18.5

19

4

Bobby scored 37 in the Maths test but missed the Science test.

Use the equation of the line of best fit to obtain an approximate score for Bobby in the Science test.

27.5

28

28.5

5

Find the equation of the line of best fit.

\[y = - 40x + 2\]

\[y = 2x + 40\]

\[y = - 2x + 40\]