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

question 40

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 whether the 4 procedures are equally effective?

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Definitions:

Vertebral Arteries

Pair of arteries that arise from the subclavian arteries and ascend in the neck to supply blood to the brain and spinal cord.

Supply Blood

The process of providing nutrients and oxygen to tissues through the circulatory system.

Limbic System

The limbic system is a complex system of nerves and networks in the brain, involved in emotions such as fear and pleasure.

Neural Connections

Neural connections, known as synapses, are the points at which neurons communicate with each other through neurotransmitters.