The accompanying table gives demographic data for 12 male patients with congestive heart f...

The accompanying table gives demographic data for 12 male patients with congestive heart failure enrolled in a study of an experimental compound.

a. Summarize these data using a boxplot for each variable.

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b. Construct scatterplots to display (1) age by cardiac index (CI) and by pulmonary capillary wedge pressure (PCWP) and (2) disease duration by CI and by PCWP. Is there evidence of a correlation between age and CI or PCWP? What about correlation between duration of disease and CI or PCWP?