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# Ten nurses were randomly selected to test the efficacy of a germicidal hand cream.

Ten nurses were randomly selected to test the efficacy of a germicidal hand cream. Total viable bacterial counts were determined by pressing the fingertips of the nurses onto nutrient agar plates before an 8-hr shift. The cream was applied and the procedure was repeated at the end of the shift. Total viable count x 10000NurseBeforeAfter1Before 3.61After 1.042Before 1.82After 1.413Before 1.981.714Before 4.21After 1.315Before 1.82After 1.206Before 1.41After 0.427Before 2.25After 1.338Before 6.41After 0.689Before 0.23After 0.9110Before 0.17After 0.22Given that the distribution of the difference between before and after counts is normal, what will be the appropriate test for this test?Select one:a. Paired Sample t Testb. Mann-Whitney Testc. Independent two sample t testd. Wilcoxon’s TestWhich of the following would be an appropriate alternative hypothesis?Select one:a. The bacterial count before using the cream is lower or equal to the level after using the creamb. The cream reduces the bacterial countc. There is no difference among the bacterial count before and after using the creamd. The cream increases the bacterial countWhat is the calculated statistics value in this test?Select one:a. 1.652b. 2.506c. 2.292d. 1.986e. 1.735What conclusion can be drawn? Select one:a. The cream didn’t reduce the bacterial counts (critical statistics = 1.734, p < 0.05).b. The cream didn't reduce the bacterial counts (critical statistics = 1.501, p >0.05).c. The cream reduced the bacterial counts (critical statistics = 1.833, p < 0.05)d. The cream reduced the bacterial counts (critical statistics = 1.812, p < 0.05).Some one found that the distribution of the difference between before and after counts is in fact non-normal, what will then be the appropriate statistical test? Select one:a. Kruskal-Wallis Testb. Mann-Whitney Testc. Paired Sample t Testd. Wilcoxon's TestBased on last question, what is the calculated statistics value for this test?Select one:a. 16b. 39c. 6d. 49Then what conclusion can be drawn?Select one:a. The cream reduced the bacterial counts (critical statistics = 8, 0.02 < p < 0.05).b. The cream didn't reduce the bacterial counts (critical statistics = 8, p > 0.05).c. The cream didn’t reduce the bacterial counts (critical statistics = 10, p < 0.025).d. The cream reduced the bacterial counts (critical statistics = 10, 0.025 < p < 0.01).

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