Refer to the epilepsy data in Table 3.19.
The researchers were interested in determining whether the treatment patients and placebo patients had differences in the number of epileptic seizures during their fourth clinic visit after receiving either the treatment or a placebo.
a. Is there significant evidence that the mean number of seizures is smaller in the treatment group than in the placebo group?
b. Compare the treatment and placebo groups relative to the variation in their ­respective number of seizures during the fourth visit.
c. Do you think that the treatment was effective? Justify your answer.

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