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ZIMSEC A-Level Statistics

6.9Bivariate data (linear regression and correlation)

Bivariate data (linear regression and correlation) in ZIMSEC A-Level Statistics: what the syllabus expects you to know, the learning objectives and how to practise.
Topic20 practice questions1 lesson
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Overview

Form 6.

Learning objectives

What the syllabus expects you to be able to do.

  1. 6.9.1Form 6: plot scatter diagrams and draw lines of best fit.
  2. 6.9.2Form 6: find the equations of least-squares regression lines.
  3. 6.9.3Form 6: calculate Pearson's product moment correlation coefficient and the coefficient of determination, and solve problems on regression and correlation.

Lessons

  • Linear regression and correlation

    50 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Bivariate data (linear regression and correlation): sample question

1 mark

For 55 pairs of values, ∑x=20\sum x = 20, ∑y=35\sum y = 35 and ∑xy=160\sum xy = 160. Find SxyS_{xy}.

Only if the answer has a unit, e.g. cm or km/h.

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