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

question 35

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 C using a 0.05 level of significance?

---

Definitions:

Full Employment

A situation in an economy where all available labor resources are being used in the most efficient way possible.

Equilibrium Price Level

This is the price point at which the demand for goods matches the supply, stabilizing the economic market without excess surplus or shortage.

Aggregate Demand Curve

Illustrates the total demand for all goods and services in an economy at various price levels, holding all else equal.

Aggregate Supply Curve

A graphical representation showing the relationship between the overall price level in an economy and the quantity of goods and services produced.