Suggested answer to exercise: Serum potassium and ambient temperature, 5

Question 5: Why is the value of 'r' wrong on the diagram?

Suggested answer

Mean serum potasium tends to be smaller when the temperature is higher, so r should be negative.

Judging from the strength of the relationship on the scatter diagram, r = -0.3 looks quite plausible.

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Last updated: 31 July, 2006.

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