An experiment done in such a way that neither the subjects nor the researchers know which subjects

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An experiment done in such a way that neither the subjects nor the researchers know which subjects are in the treatment group and which are in the control group is called: 

A. Double barreled. 

B. Double sided. 

C. Double negative. 

D. Double jeopardy. 

E. Double blind.

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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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