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

question 61

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,what is the value of the critical range for the Marascuilo procedure to test for the difference in proportions between procedure A and procedure B using a 0.05 level of significance?

---

Definitions:

Single-mother Families

Family units headed by a single female parent, managing parenting and household responsibilities without a cohabiting partner.

Increasing Dramatically

Refers to a rapid and significant rise or growth in intensity, quantity, or extent.

Arlie Hochschild

A sociologist recognized for her research on the emotional and social demands placed on workers, especially in the context of family and work balance.

Second Shift

Second Shift refers to the phenomenon where individuals, particularly women, work a paid job outside the home and then come home to perform unpaid household labor.