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

question 37

True/False

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,there is sufficient evidence to conclude that the proportions between procedure A and procedure C are different at a 0.05 level of significance.

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Definitions:

Total Debt Ratio

A financial ratio that measures the proportion of a company's assets financed by its total debt.

Net Working Capital

A measure of a company's efficiency and its short-term financial health, calculated by subtracting current liabilities from current assets.

Total Assets Ratio

A financial metric comparing total assets to another key financial figure, often used to assess a company's size, efficiency, or leverage.

Accounts Payable

Money owed by a business to its suppliers or creditors for goods and services purchased on credit, typically due within a short-term period.