4. Which of the following is/are correct?
(A) A "scatterplot" is good for obtaining the potential
association between two numerical variables；
(B) Unlike "bar graph", a "histogram" has no natural
separation between rectangles of adjacent classes；
(C) A "pie chart" is good for comparing the means
of a numerical variable between two independent groups；
(D) In a "Box-plot", the line drawn in the
box indicates the location of the mean；
(E) "100% stacked area chart" can be used to compare the
change in distribution of a categorical variable over a period of time.
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