Lecture 5: Survey Nitty Gritty

The correlation between speed and mileage is r = 0. Explain why the correlation is 0 even though there is a strong relationship between speed and mileage. ... The relationship is . nonlinear, correlation measures the strength of only straight-line . ... linear or nonlinear? L. inear . Direction: positive or negative (or no association)? N ... ................
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