Suppose you have 19 data points and you calculate the sample correlation coefficient and find that r = - .50. Can you be 95% confident that a linear relation exists between the variables? If so, is the relation positive or negative? Justify you answer.
Added by Richard M.
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The formula for df is df = n - 2, where n is the number of data points. In this case, df = 19 - 2 = 17. Show more…
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