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

question 114

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 A and procedure C are different at a 0.05 level of significance.

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Definitions:

Robert Oppenheimer

A physicist known as the "father of the atomic bomb" for his role in the Manhattan Project, the World War II project that developed the first nuclear weapons.

Leslie Groves

A U.S. Army Corps of Engineers officer and the director of the Manhattan Project, the project during World War II that developed the first nuclear weapons.

Atom Bomb

A powerful weapon of mass destruction that releases energy through nuclear reactions, causing widespread destruction.

Hiroshima, Japan

A city in Japan that was the target of the first atomic bomb used in warfare, dropped by the United States on August 6, 1945.