How do I make a histogram for grouped (frequency) data?
Minitab does not expect data to be summarized or grouped, and therefore is not geared to graph this type of data under the histogram option. However, you can still graph summarized data by using GRAPH CHART. Under Function select SUM. In the y column select the frequency (count). In the x column select the actual variable. To make the bars touch select ATTRIBUTES, scroll to the right and set the bar width to 1.