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

question 88

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 expected cell frequency for the Procedure A/Clear cell is ________.

---

Definitions:

Total Union Membership

The sum of all individuals who are members of labor unions, representing workers in negotiations with employers regarding wages, working conditions, and other employment-related matters.

Economy

The large set of inter-related production, consumption, and exchange activities that aid in determining how scarce resources are allocated.

Collective Bargaining

The negotiation of labor contracts between labor unions and firms or government entities.

Union Workers

Employees who are members of a labor union, which represents their interests in negotiations with employers.