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2 Unit AS 2: Applied Mathematics

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Question 101

For 20 districts, a researcher obtains r=−0.955r=-0.955r=−0.955 between an air-quality score x x\,x and respiratory-disease rate yyy. A given regression line for life expectancy z z\,z on x x\,x is z=76.8+0.703xz=76.8+0.703xz=76.8+0.703x.

a.

Interpret rrr.

[2]
b.

Estimate z z\,z when x=10.5x=10.5x=10.5.

[1]
c.

Interpret the gradient of the regression line.

[2]
d.

Explain why neither result alone proves that changing the air-quality score will change health outcomes.

[1]
Markscheme

2 Unit AS 2: Applied Mathematics Questions

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

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