1. A study
is performed to compare several different pain reducing medications for the
treatment of migraine headaches.The drugs tested are:Placebo, Tylenol, Excedrin, Imitrex.Four hundred migraine sufferers were recruited for the
study and they were randomly assigned to one of the four groups and were given
unmarked tablets to take when they had a migraine.The effectiveness of pain relief was documented with a
survey and compared between groups.Which statistical test should be used to compare the
pain relief effectiveness between the four groups?
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