Hi, I’m racking my brain trying to figure out why #10 in this exercise is not valid. If Sundae = offered extra cherry and MOST (51+%) say yes then at least 51% have extra cherry sundae.
If SOME banana split offered extra cherry and less than half say yes then At MOST (Some=100%) 49% have free cherry Spilt. Right?
(Using these numbers for ease) So, why isnt it valid to say more customers get a free cherry with sundae than banana?
Hey Jessica — it’s because we don’t know how the # of people who order the sundae compares to the # of people who order the banana split. If more people order the banana split then the conclusion doesn’t have to be true. HTH – MK