Suppose patients are graded on the degree of change in periodontal status on a 7-point scale, with +3 indicating the greatest improvement, 0 indicating no change, and -3 indicating the gre decline. The data are given in the table below. Degree of Change in Periodontal Status Change Score Number of Patients +3 +2 +1 0 -1 -2 -3 3 4 5 4 5 2 2 (b) Taking into account the 7-point scale, what nonparametric test can be used to determine whether a significant change in periodontal status has occurred over time? O the sign test O the Wilcoxon rank-sum test the Wilcoxon signed-rank test

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