Instruction 15-6
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 |
$$\begin{array} { | l | c | c | c | c | c | }
\hline & \text { A } & \text { B } & \text { C } & \text { D } & \text { Total } \
\hline \text { Clear } & 27 & 41 & 21 & 7 & 96 \
\hline \text { Return } & 11 & 15 & 9 & 11 & 46 \
\hline \text { Total } & 38 & 56 & 30 & 18 & 142 \
\hline
\end{array}$$ 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 15-6,there is sufficient evidence to conclude that the proportions between procedure A and procedure B are different at a 0.05 level of significance.

Question

Instruction 15-6
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 |
 $$\begin{array} { | l | c | c | c | c | c | } 
\hline & \text { A } & \text { B } & \text { C } & \text { D } & \text { Total } \
\hline \text { Clear } & 27 & 41 & 21 & 7 & 96 \
\hline \text { Return } & 11 & 15 & 9 & 11 & 46 \
\hline \text { Total } & 38 & 56 & 30 & 18 & 142 \
\hline
\end{array}$$ 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 15-6,there is sufficient evidence to conclude that the proportions between procedure A and procedure B are different at a 0.05 level of significance.

Quizplus · Accepted Answer

The question does not provide the results of the chi-square test, including the calculated chi-square statistic or the p-value, which are necessary to determine if there is a significant difference between the proportions of clear operations for procedures A and B at the 0.05 level of significance. Without this information, we cannot conclude there is sufficient evidence of a difference.

Instruction 15-6 Four Surgical Procedures Currently Are Used to Install

Instruction 15-6
Four Surgical Procedures Currently Are Used to Install