bivariate
Year 11 Chance & Data
Trend
Trend
For linear trends, the gradient stays the same.
For nonlinear trends, the gradient changes.
direction
direction
strength
strength
line of best fit
line of best fit
outliers
outliers
Variation / scatter
Variation / scatter
Notice how the data values change each time you take a sample.
Notice how the line of best changes each time you take another sample.
But even when you take another sample, the relationship is still in the same direction and strength.
Walker Workbook
Walker Workbook
Pages46 - 53
Pages46 - 53
Multivariate
Chance & Data
Time Series