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

question 51

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 B and procedure D using a 0.05 level of significance?

---

Definitions:

Longitudinal

Describes research or studies conducted over a long period of time, tracking the same subjects to observe changes.

Prospective Epidemiological

Studies designed to follow participants forward in time to examine the relationships between suspected risk or protective factors and health outcomes.

Cross-sectional

A study design that examines a population or a subset at one specific point in time, providing a snapshot of variables or outcomes.

Follow-up Findings

Outcomes or conclusions reached after additional examination or analysis subsequent to initial investigation or study.