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stem-and-leaf display is a graphical portrayal of a data set that shows the
data set's overall pattern of variation.
relative frequency is the frequency of a class divided by the total number of
bar chart is a graphic that can be used to depict qualitative data.
displays and dot plots are useful for detecting outliers.
scatter plot can be used to identify outliers.
looking at the shape of the distribution using a stem-and-leaf, a distribution
is skewed to the right when the left tail is shorter than the right tail.
we wish to summarize the proportion (or fraction) of items in a class we use
the frequency distribution for each class.
establishing the classes for a frequency table it is generally agreed that the
more classes you use the better your frequency table will be.
sample cumulative distribution function is non-decreasing.
frequency table includes row and column percentages.
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