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2 Statistics

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Question 17

Two surveys estimate support for a transport proposal. Survey A is an open online poll with 5000 responses. Survey B is a stratified random sample of 400 residents, with 68% response within each age stratum.

a.

Explain why the larger response count does not necessarily make Survey A more reliable.

[2]
b.

Identify one remaining source of bias in Survey B.

[1]
c.

Describe two checks or refinements before using Survey B to infer support among all residents.

[2]
Markscheme

2 Statistics Questions

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

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