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1 markData Analysis

CAPE Applied Mathematics Unit 1 · 2011 · Paper 2 · Question 5(b)(i)

Calculate x̄, the mean of x.

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Other parts of this question

  1. 5(a)On the answer sheet provided, draw a scatter diagram of the data in the table.[4 marks]
  2. 5(b)(ii)Calculate ȳ, the mean of y.[1 mark]
  3. 5(b)(iii)Plot the point (x̄, ȳ) on the scatter diagram.[2 marks]
  4. 5(c)Calculate the equation of the regression line of y on x and draw this line on the scatter diagram.[7 marks]
  5. 5(d)Calculate the product-moment correlation coefficient r, and interpret the value obtained relative to the scatter diagram.[5 marks]
  6. 5(e)Use your regression line to estimate the actual age of a person whose age was predicted as 45 years.[3 marks]
  7. 5(f)Comment on the reliability of the value obtained in Part (e).[2 marks]

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