How does an outlier effect the mean of a population? how does an outlier effect the median of a population? how does an outlier effect the range of a population?

An outlier causes the range of the population to move slightly towards the outlier.

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.