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2 Statistics

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Question 26

For the 186 LDS9 records with both age and average systolic blood pressure available, a fitted regression line is

s=0.561a+97.7s=0.561a+97.7s=0.561a+97.7,

where a a\,a is age in years and s s\,s is average systolic blood pressure in mm Hg. Ages in the data set range from 17 to 85 years.

a.

Use the model to estimate average systolic blood pressure for a 60-year-old.

[2]
b.

Explain why using the model for a 10-year-old would be unreliable.

[1]
c.

A student says that the model proves ageing causes systolic blood pressure to rise. Explain why this conclusion is not justified.

[2]
Markscheme

2 Statistics Questions

  1. A Level
  2. /Maths
  3. /2 Statistics

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