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In an experiment involving a treatment applied to 6 test subjects, researchers plan to use a simple random sample of 6 subjects selected from a pool of 8 availa

Choices are ;
 
 210
 
250
 
28
 
7776

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James F. | Statistics Graduate Student and TutorStatistics Graduate Student and Tutor
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The number of ways to select 6 from 8 (when order does not matter) is:
 
8 Choose 6 = 8! / 6!(8-6)! = 8*7 / 2 = 28
 
 
J.T.