Problem $2.$ Exercise $2\mathrm{.}2\mathrm{.}2$ of Samuels, Witmer, and Schaffner $(1989)$

In a study of schizophrenia, researchers measured the activity of the enzyme monoamine oxidase $($MAO$)$ in the blood platelets of $18$ patients. The results $($expressed as nmoles benzylaldehyde product per $108$ platelets$)$ were as follows:

$\backslash$table$[[6\mathrm{.}8,8\mathrm{.}4,8\mathrm{.}7,11\mathrm{.}9,14\mathrm{.}2,18\mathrm{.}8],[9\mathrm{.}9,4\mathrm{.}1,9\mathrm{.}7,12\mathrm{.}7,5\mathrm{.}2,7\mathrm{.}8],[7\mathrm{.}8,7\mathrm{.}4,7\mathrm{.}3,10\mathrm{.}6,14\mathrm{.}5,10\mathrm{.}7]]$

a$.$ Enter the data into a vector named MAO. That is$,$ execute the following command:

$)$

$9\mathrm{.}9,4\mathrm{.}1,9\mathrm{.}7,12\mathrm{.}7,5\mathrm{.}2,7\mathrm{.}8,$

$(7\mathrm{.}8,7\mathrm{.}4,7\mathrm{.}3,10\mathrm{.}6,14\mathrm{.}5,10\mathrm{.}7$

b$.$ Choose a plot that is appropriate for summarizing this data and create the plot using R$.$ Hint: this depends on whether the data is numerical or categorical, for example: you cannot use a histogram for categorical data.

c$.$ Using the plot you chose for part b$,$ describe the shape of the distribution.