Whenever you suspect that the passage of time is one of the factors influencing one or more of the other variables you are investigating.
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No, but quantitative data can.
bar graph circle graph scatter plot box and whisker stem and leaf plot ven diagram. Line graph
A moderately small number of discrete quantitative data.
B/c it can help to display the subsets in the data. It is also a good way to double check the data and scatterplot.
stem and leaf plot