that first graph we looked at had bars and it was called a bar chart or bar graph and then we saw the pie graph along with that, and the basic thing for a numerical summary is just summarizing the counts or percentages that fall into each category, we did that for the sleep deprived status variable, and then we went on to our quantitative variable where we had students say how much hours of sleep they typically get per night and the quantitative variable to show its distribution, and by distribution we just mean, give me an idea of are that that variable can take on and how often they tend to occur, and the nice picture for the distribution of a quantitative variable was also one with bars but its wasn't a bar chart, it was called a ... histogram. 