Instruction 15-6
Four Surgical Procedures Currently Are Used to Install

question 101

Short Answer

Instruction 15-6
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 centre wants to compare the proportion of clear operations for the four procedures, and collects the following numbers of patients from their own records:
| Procedure |
$$\begin{array} { | l | c | c | c | c | c | } \hline & \text { A } & \text { B } & \text { C } & \text { D } & \text { Total } \\\hline \text { Clear } & 27 & 41 & 21 & 7 & 96 \\\hline \text { Return } & 11 & 15 & 9 & 11 & 46 \\\hline \text { Total } & 38 & 56 & 30 & 18 & 142 \\\hline\end{array}$$ They will use this information to test for a difference among the proportion of clear operations using a chi-square test with a 0.05 level of significance.
-Referring to Instruction 15-6,what is the value of the critical range for the Marascuilo procedure to test for the difference in proportions between procedure A and procedure C using a 0.05 level of significance?

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Definitions:

Inventory System

A mechanism for tracking and managing items that a company holds in stock, covering aspects like ordering, storing, using, and selling these goods.

Perpetual

Continuing indefinitely without a predetermined end in the context of perpetual inventory systems that continually update to reflect buying and selling activities.

Credit Period

The amount of time the buyer is allowed in which to pay the seller.

Merchandise

Goods that are bought and sold in business transactions.