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

question 20

True/False

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

---

Definitions:

Scenes

Specific locations or settings where action takes place within a play, movie, book, or other narrative mediums.

Washington, D.C.

The capital city of the United States, known for housing the federal government's three branches and various national monuments.

Labor Day

A public holiday celebrated in various countries to honor the labor movement and the contributions of laborers to the development and achievements of the country.

Men's Department

A section in a store dedicated to clothing, accessories, and items specifically designed for men.