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A researcher is testing the effect of a new cold and flu medication on reaction time. A sample of n = 9 students is obtained and each student is given the normal dose of the medicine. Thirty minutes later, each student's reaction time is measured. The scores for the sample averaged M = 211 milliseconds with SS = 1152.

(a) Assuming that reaction time for students in the regular population averages μ = 200 milliseconds, are the data sufficient to conclude that the medication has a significant effect on reaction time? Test at the .05 level of significance.

A. The medication has a significant effect on reaction time.

B. The medication hasn't any significant effect on reaction time.

(b) Compute r2, the percentage of variance explained by the treatment effect. (Round the answer to three decimal places.)
r^2 = ______

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Statistics and Probability, Statistics

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