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Question 347

A regression line of examination mark, yyy, on hours of study, xxx, is y=38+4.6xy=38+4.6xy=38+4.6x, based on 1≤x≤81\leq x\leq81≤x≤8.

a.

Estimate the mark for x=6x=6x=6.

[2]
b.

A student says that studying one extra hour will cause every mark to increase by 4.6. Give two criticisms.

[2]
Markscheme

2 Statistics Questions

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

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