Ionized wrist bracelets are advertised and marketed as painkillers. to test this claim, 610 men and women were randomly assigned to wear either an ionized bracelet or a placebo bracelet for 28 days. at the end of 28 days, a pain score was recorded for each subject.
a report stated that "at α = 0.05, researchers found that there was no signficant difference between the mean pain scores for the ionized bracelet group and the placebo bracelet group."
what is meant by no significant difference?
a. the difference between the average pain score of the sample placebo bracelet group and the average pain score of the sample ionized bracelet group is so large that it gives evidence that the ionized bracelet is effective.
b. the difference between the average pain score of the sample placebo bracelet group and the average pain score of the sample ionized bracelet group is so small that it is probably due to chance variation alone.
c. the probability of the average pain score of the ionized bracelet group being lower than the average pain score of the placebo bracelet group is quite high.