TABLE 12-9
Four Surgical Procedures Currently Are Used

question 63

True/False

TABLE 12-9
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 center wants to compare the proportion of clear operations for the 4 procedures, and collects the following numbers of patients from their own records:
$$\begin{array}{l}\text {\quad\quad\quad\quad\quad\quad\quad Procedure }\\\begin{array} { l | r r r r | r } & \text { A } & \text { B } & \text { C } & \text { D } & \text { Total } \\\hline \text { Clear } & 27 & 41 & 21 & 7 & 96 \\\text { Return } & 11 & 15 & 9 & 11 & 46 \\\hline \text { Total } & 38 & 56 & 30 & 18 & 142\end{array}\end{array}$$ They will use this information to test for a difference among the proportion of clear operations using a chi-square test with a level of significance of 0.05.
-Referring to Table 12-9, there is sufficient evidence to conclude that the proportions between procedure B and procedure D are different at a 0.05 level of significance.

---

Definitions:

Highly Liquid

An asset or investment that can be quickly converted into cash without much loss in value, ensuring easy accessibility of funds.

Certificates of Deposit

Time deposit financial products provided by banks that offer a fixed interest rate in exchange for keeping a deposit untouched for a predetermined period.

Petty Cash

A small amount of cash on hand used for covering minor expenses, managed through a petty cash fund.

Money Orders

A financial instrument, purchased for a specific amount of money, that is used for making payments from one party to another.