The following table lists several types of graphs that we should be familiar with. Put a mark in each cell for which that type of graph indicated in the column can be used for the purpose indicated in the row. (Note: Multiple types are possible for each question.)
Question Bar Plot Histogram Boxplot Dot Plot
Which category has more instances (or cases)?
Which group has a higher center?
What is the spread of the data about the center?
Is the distribution of the data skewed?
Is the distribution of the data multi-modal?
Which group has a bigger spread?
Are two interval scale variables related?
Are there any outliers?
What percentage of the data is above a certain value on one of the variables?