Four surgical procedures currently are used to install pacemakers.If the patient does not need to return for follow-up surgery,the operation is called a "clear" operation.A heart center wants to compare the 4 procedures,and collects the following numbers of patients from their own records: Which of the following tests will be the most appropriate to find out whether the 4 procedures are equally effective? A)$\chi$² test for difference in proportions. B)Z test for difference in proportions. C)One-way ANOVA F test for differences among more than two means D)Kruskal-Wallis rank Test.

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The Answer of Four surgical procedures currently are used to install pacemakers.If the patient does not need to return for follow-up surgery,the operation is called a "clear" operation.A heart center wants to compare the 4 procedures,and collects the following numbers of patients from their own records: Which of the following tests will be the most appropriate to find out whether the 4 procedures are equally effective? A)$\chi$² test for difference in proportions. B)Z test for difference in proportions. C)One-way ANOVA F test for differences among more than two means D)Kruskal-Wallis rank Test.

Four Surgical Procedures Currently Are Used to Install Pacemakers χ\chiχ 2 Test for Difference in Proportions

Four Surgical Procedures Currently Are Used to Install Pacemakers $\chi$ ² Test for Difference in Proportions