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2 Unit 2: Applied Mathematics A

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Question 16

The values of x x\,x and y y\,y for six trials are

x123456y35881113\begin{array}{c|rrrrrr}x&1&2&3&4&5&6\\\hline y&3&5&8&8&11&13\end{array}xy​13​25​38​48​511​613​​

a.

Describe the correlation shown by the data.

[1]
b.

A regression line for predicting y y\,y from x x\,x is y=1.943x+1.200y=1.943x+1.200y=1.943x+1.200. Estimate y y\,y when x=4.5x=4.5x=4.5.

[2]
c.

Interpret the gradient in context if x x\,x is dose in mg and y y\,y is response score.

[1]
d.

State one reason why using the line at x=20x=20x=20 would be unreliable.

[1]
Markscheme

2 Unit 2: Applied Mathematics A Questions

  1. A Level
  2. /Maths
  3. /2 Unit 2: Applied Mathematics A

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