has chosen a stemplot to display the data. What advantage does Alice’s display have over Joyce’s display?

Dotplots make it easier to construct large data sets, while stemplots do not.
Dotplots allow for data to be sorted as values are plotted, while stemplots require values to be sorted before they are entered in the plot.
Dotplots make it easy to determine the shape of a distribution, while stemplots do not.
Dotplots show the original data, while stemplots do not.