For which of these would you, most likely, want to use a paired design for the study?

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For which of these would you, most likely, want to use a paired design for the study? 

A. Compare males and females on how many Facebook friends they have 

B. Compare the income levels of Republicans and Democrats 

C. Compare the weight of soldiers before and after completing basic training 

D. Compare the wingspan of robins and starlings

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Introduction To Statistical Investigations

ISBN: 9781119683452

2nd Edition

Authors: Beth L.Chance, George W.Cobb, Allan J.Rossman Nathan Tintle, Todd Swanson Soma Roy

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