Janelle filled out a peer evaluation rating form for her teammates in her OB class. She rated everyone as a ""3"" or ""4"" on the 6-point scale. This is an example of perceptual error.

The major difference is that a histogram is only used to plot the frequency of score occurrences in a continuous data set that has been divided into classes, called bins.  bar charts, on the other hand, can be used for a great deal of other types ofvariables  including  ordinal  andnominal  data sets.