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F-Ratio with Degrees of Freedom of 1 and 18.

A researcher who is evaluating the significance of a regression equation with one predictor variable obtains an F-ratio with df of 1 and 18. How many pairs of scores, x and y values, are in the data?

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Number of Groups = k
Sample Size = N

Degrees of Freedom for Between Treatments, df=(k-1)= 1