The s subjects in an experiment are divided into 4 groups

[ShahidB174]

[redacted]

[RonPurewal]

hello,
please read the forum rules before posting!

per the rules, we need a citation of the original source of the problem. without such a citation, we can't discuss the problem.

please re-post this question with an appropriate citation. thank you.

[RonPurewal]

also-- when you post a problem, you need to post something specific about it.
i.e., do NOT just post a problem without any comments or questions. (the point of this site is to be a discussion forum, not an "answer key".)

please post...
• what do you already understand?
• what don't you understand?
• what approach(es) have you already tried?
etc.

thanks.