Use the t value you calculated for Exercise 1 in Chapter 7 to find the point-biserial r
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Use the t value you calculated for Exercise 1 in Chapter 7 to find the point-biserial r that corresponds to the difference in means between Turck and Kirk Halls. Then use the appropriate t formula to test the rpb you just computed for significance. How does this t value compare with the original t value you calculated for Exercise 1 in Chapter 7?
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Related Book For 
Introductory Statistics For The Behavioral Sciences
ISBN: 9780470907764
7th Edition
Authors: Joan Welkowitz, Barry H. Cohen, R. Brooke Lea
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