TABLE 12-9
Four Surgical Procedures Currently Are Used

question 104

Short Answer

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, the expected cell frequency for the Procedure A/Clear cell is______

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Definitions:

"Passed Through"

A process in which financial benefits or obligations are transferred from one party to another, often used in the context of mortgage-backed securities.

Unit Investment Trusts

Fixed portfolios of stocks, bonds, or other securities assembled by a sponsor, which are then sold in shares to investors, offering a fixed return over the trust's lifespan.

Fixed-Income Portfolios

Investment portfolios that consist primarily of debt securities like bonds, which are designed to provide a fixed return through interest payments to investors over time.

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A strategy where a fund's investments are frequently adjusted by a manager or management team in an attempt to outperform the market.