Ice Cream Store Exercise: #10 Invalid?

  • October 21, 2017 at 10:32 am #3330
    jbontemps
    Participant

    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?

  • October 21, 2017 at 12:45 pm #3331
    Mike Kim
    Keymaster

    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

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