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Exam 4: Bivariate Description: Crosstabulation, Risk Indexes, and Correlation

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Question 21

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Pearson's r is an index that communicates:

A) Relative risk
B) Relative risk reduction
C) Correlation between two variables
D) None of the above

E) A) and B)
F) A) and C)

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Question 22

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A widely reported and intuitively appealing risk index for comparing risk outcomes is:

A) Relative risk (RR)
B) Absolute risk (AR)
C) Odds ratio (OR)
D) Number needed to treat (NNT)

E) All of the above
F) B) and D)

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Question 23

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Which of the following values is likely to appear on the diagonal of a correlation matrix?

Questions pertain to the following table (Table 4) : $\begin{array}{c}\text { Table } 4\\\text { Crosstabulation of Cognitive Impairment Status and Fall Incidence in Hospitalized}\\\text { Elders }\\\begin{array}{r}\\\text { Fall? } \quad\quad\quad\quad\quad\quad\quad\\\begin{array}{|l|l|l|c|c|c|}\hline &&&\text { Yes } & \text { No }&\text { Total }\\\hline \text { Cognitive}&\text { Yes } & \text { Count } & 10 & 30 & 40 \\ \text { Impairment? } &&\% \text { (within falls) } & 25.0 \% & 75.0 \% & 100.0 \% \\&&\% \text { (within impairment) } & 50.0 \% & 25.0 \% & \\\hline &\text { No }&\text { Count } & 10 & 90 & 100 \\&&\% \text { (within falls) } & 10.0 \% & 90.0 \% & 100.0 \% \\&&\% \text { (within impairment) } & 50.0 \% & 75.0 \% & \\\hline &\text { Total }& \text { Count } & 20 & 120 & 140 \\&&\% \text { (within falls) } & 14.3 \% & 85.7 \% & 100.0 \% \\&&\% \text { (within impairment) } & 100.0 \% & 100.0 \% & 100.0 \%\\\hline\end{array}\end{array}\end{array}$ -Refer to Table 4. What was the absolute risk of falling for elders who were cognitively compared?

Product-moment correlation coefficients are used to communicate information about: