The following data represent the means for each treatment condition in a two factor experiment. Note that one mean is not given. What value for the missing mean would result in no main effect for factor B?                       B1              B2 ​ A1 ​ 10 ​ 25 ​ A2 ​ 40 ​ ?​ Select one: a. ​ 30 b. ​ 25 c. ​ 10 d. ​ 15

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