Question: Modify the data in Exercise 13.6 by shifting the entries in the 12 hour column so as to increase the relationship between the two variables.

Modify the data in Exercise 13.6 by shifting the entries in the “12 hour” column so as to increase the relationship between the two variables. Run a t test on the modified data and notice the effect on t. (You could never do this with real data, because paired scores must be kept together, but doing so here reveals the important role played by the relationship between variables.)

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