Four Surgical Procedures Currently Are Used to Install Pacemakers Which of the Following Tests Will Be the Most Appropriate

Multiple Choice

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:

Procedure
$$\begin{array} { | r | c c c c | c | } \hline & \text { A } & \text { B } & \text { C } & \text { D } & \text { Total } \\\hline \text { Clear } & 27 & 41 & 21 & 7 & 96 \\\hline \text { Retur1 } & 11 & 15 & 9 & 11 & 46 \\\hline \text { Total } & 38 & 56 & 30 & 18 & 142 \\\hline\end{array}$$
Which of the following tests will be the most appropriate to find out which of the 4 procedures is the most effective?

A) X² 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) The Marascuilo procedure