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If two variables are correlated, does that mean one causes the other? Explain If the correlation between the length of stay for a patient and

If two variables are correlated, does that mean one causes the other? Explain

If the correlation between the length of stay for a patient and the number of diagnostic tests performed during the stay is positive, then what may be concluded about the slope of the regression line fit between the two variables? What will this regression line look like?

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