Instruction 15-8
Four Surgical Procedures Currently Are Used to Install

question 69

Short Answer

Instruction 15-8
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 |
$$\begin{array} { | l | c | c | c | c | c | } \hline & \mathrm { A } & \mathrm { B } & \mathrm { C } & \mathrm { D } & \text { Total } \\\hline \text { Clear } & 27 & 41 & 21 & 7 & 96 \\\hline \text { Return } & 11 & 15 & 9 & 11 & 46 \\\hline \text { Total } & 38 & 56 & 30 & 18 & 142 \\\hline\end{array}$$ 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 15-8,the value of the test statistic is ________.

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Definitions:

Financial Reports

Official records that detail a company's financial performance over a specified period, including income statements, balance sheets, and cash flow statements.

Compressed Work-week

An alternative work schedule that allows employees to work their full required hours within fewer days per week, often resulting in longer daily hours but a shorter workweek.

Flexible Work Schedule

A work arrangement that allows employees to vary their arrival and departure times, as well as choose their work hours, within agreed-upon limits.

Employee Participation Programs

Initiatives that involve employees in decision-making processes, typically to increase engagement, satisfaction, and productivity.