TABLE 12-9
Four Surgical Procedures Currently Are Used to Install

question 206

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 12-18, the decision rule for a level of significance of 0.05 using the Kruskal-Wallis test is to reject the null hypothesis if the test statistic H is _______assuming that the sample sizes are large enough to use a chi-square approximation.

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Definitions:

Short-Term Memory

The capacity for holding a small amount of information in an active, readily available state for a short period.

Everyday Memory

The capacity to remember and recall day-to-day events and interactions, crucial for normal functioning and social interaction.

Memory Strategies

Techniques that enhance an individual's ability to retain, recall, and reconstruct memories.

Improve Memory

Actions or strategies aimed at enhancing the ability to store, retain, and recall information.