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Scatter diagrams and correlation

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How do you use scatter diagrams, a line of best fit and Spearman's rank to measure and describe the correlation between two variables?

Draw and interpret scatter diagrams, describe correlation, use a line of best fit to estimate values (interpolation and extrapolation), understand that correlation does not imply causation, and calculate and interpret Spearman's rank correlation coefficient.
A CCEA GCSE Statistics answer on bivariate data: scatter diagrams, types and strength of correlation, the line of best fit, interpolation and extrapolation, correlation versus causation, and Spearman's rank correlation coefficient.
12 min answer →