Correlation and the Correlation Coefficient
30 tutor-authored questions for this Ontario curriculum expectation, ordered easiest to hardest, every one with a full worked solution. Work through all 30 with your weekly-lesson access code.
Sample: the first question, solved
What does the "correlation coefficient" (r) measure?
📘 Worked solution
✓The strength and direction of the linear relationship between two variables.
And one from the hard end
A national data set shows r=0.89 between a city's per-capita coffee shop density and its per-capita startup rate, even after statistically adjusting for population size and median income. A journalist concludes coffee "fuels innovation." Identify the strongest remaining threat to this causal claim.
Solution shown after you try it in practice mode.
Work through all 30, easiest to hardest
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