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2 Statistics

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Question 172

For winter days, a regression line for daily energy cost, e e\,e pounds, on mean temperature, ttt °C, is e=7.3−0.4te=7.3-0.4te=7.3−0.4t.

a.

Describe the correlation indicated by the line.

[1]
b.

Interpret the gradient.

[1]
c.

Estimate the cost when t=5t=5t=5.

[1]
Markscheme

2 Statistics Questions

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

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