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2 Statistics

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Question 513

A data set has correlation coefficient 0.91. After one unusual observation is included, the coefficient becomes 0.54.

a.

Describe the effect of the unusual observation on the apparent linear association.

[2]
b.

Explain what should be checked before deciding whether to omit that observation.

[2]
Markscheme

2 Statistics Questions

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

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