A manufacturer of suntan lotion is testing two suntan lotions to compare their levels of protection against sunburn. Sixteen. Subjects are chosen and randomly divided into two groups. Lotion A is applied to the back each subject in one group and. Lotion B to the back of each subject in the other. Each subject is then exposed to a controlled but intense amount of, sun. Degree of sunburn was measured for, each subject with the results shown below (higher numbers represent more severe sunburn).
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