Question

Nurses monitored 79 infants for pain in reaction to a vitamin K injection. They assigned a score of 0 through 7 from the Neonatal Infant Pain Scale (NIPS) at 30,60, and 120 seconds after the injection,T0, T30, T60, and T120 seconds. Higher scores meant more pain (Alcock, 1993).

Deandre, a student intern, believes that NIPS scores were higher at T30 seconds than at T120 and conducts a Wilcoxon signed rank test.

The 12 pairs of T30 and T120 NIPS scores are displayed here.

?30: 2, 0, 4, 0, 0, 7, 1, 7, 6, 6, 3, 6

?120: 0, 1, 1, 4, 1, 4, 0, 6, 4, 1, 0, 2

Select the correct null H0 and alternative H1 hypotheses for this test.

H0: There is no difference between the population distributions of NIPS scores at T30 seconds and at T120 seconds.

H1: The population distribution of one set of scores is systematically higher or lower than the other.

H0: There is no difference between the population distributions of NIPS scores at T30 seconds and at T120 seconds.

H1: The population distribution of NIPS scores at T30 seconds is systematically higher than that at T120 seconds.

H0: There is no difference between the population distributions of NIPS scores across groups of infants.

H1: The population distribution of NIPS scores for one group of infants is systematically higher or lower than the other group’s distribution.

H0: There population distributions of NIPS scores at T30 seconds and at T120 seconds are statistically independent.

H1: There population distributions of NIPS scores at T30 seconds and at T120 seconds are not statistically independent.

What is the Wilcoxon signed ranks statistic,W+, for this test? Round your answer to one decimal place.

W+ =

Answer 1

H0: There is no difference between the population distributions of NIPS scores at T30 seconds and at T120 seconds.

H1: The population distribution of NIPS scores at T30 seconds is systematically higher than that at T120 seconds.

W+ = 62.5

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