GCSE Statistics Chapter 5 Summary- Scatter Diagrams and Correlation

After completing this chapter, you will be able to;

  • Draw scatter diagrams
  • Recognise correlation
  • Know what is meant by a casual relationship
  • Draw lines of best fit on scatter diagrams
  • Know what is meant by a mean point
  • Use lines of best fit to make predictions
  • Find the equation of a line of best fit
  • Fit a line of best fit to a non-linear model
  • Calculate and interpret Spearman’s rank correlation coefficient
  • Know what to do with tied ranks.
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Scatter diagrams

1.) If the points on a scatter diagram lie approximately on a straight line, there is
a linear relationship between them. They are associated.


2.) Correlation is a measure of the strength of the linear association between
two variables.

3.) Negative correlation is when one variable decreases…

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Nonlinear models

16.) The graphs of nonlinear models are in the form of y=axn + b

Spearman's rank correlation coefficient

17.) Spearman's rank correlation coefficient is a numerical measure of the
agreement of the correlation between two sets of data. It tells us how close the
agreement is.

18.) Spearman's…


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