I have a chart of last year revenue for 5 different retailers. To me that seems like quantitative data because they are measured numbers. However, if I try to show it in a graph, it needs to be a bar graph of revenue for each store, which implies qualitative data. Which type of data is it???
Revenue is quantitative. A bar graph can be quantitative, just label the bars and make the heights of the bars proportional to the revenue numbers. For example, if Company A's revenue was twice as much as Company B's revenue then make the bar for Company A twice as high as the bar for Company B. A bar graph can have labels on the Y-axis that indicate revenue levels. Only the X-axis on a bar chart is qualitative, which in this case would just be the names of the retailers (which is qualitative).