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What's on the worksheet
- Name the most plausible explanation for each association and the third variable if there is one.
- School sick days: examine the claim that walking to school means fewer sick days.
- Six shopping malls: compare visitors, first-aid calls and lost items.
- Two driving schools and two test centers: find how the center confounds the pass rates.
- Summer reading challenge: judge a claim when students chose whether to join.
- Basketball coach: weigh extra shooting practice against changes in player results.
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The free lesson teaches it with worked examples and practice problems.
Correlation is not causation: lurking and confounding variables: the lesson ›More Chapter 13 worksheets: Two-variable statistics
- 13.1Fitting linear and exponential models with technology
- 13.2Predicting with a regression line, and extrapolation
- 13.3Interpreting a residual
- 13.4Making and reading residual plots
- 13.5The correlation coefficient
- 13.6Properties of the correlation coefficient
- 13.7Observational studies and experiments
- 13.8Correlation is not causation: lurking and confounding variables
- 13.9Describing a scatter plot
- 13.10Line of best fit
- 13.11Conditional relative frequencies