wo sun blockers are to be compared. One blocker is rubbed on one side of a subject’s back and the other blocker is rubbed on the other side. Each subject then lies in the sun for two hours. After waiting an additional hour, each side is rated according to redness. Subject No. 1 2 3 4 5 Blocker 1 2 7 8 3 5 blocker 2 2 5 4 1 3 According to the redness data, the research claims that blocker 2 is more effective than block 1.
(a) Compute the difference value for each subject.
(b) Compute the mean for the difference value.
(c) Formulate the null and alternative hypotheses.
(d) Conduct a hypothesis test at the level of significance 1%.
(e) What do you conclude?
