10.1 The “state” variable is a categorical variable. For categorical variables, we should use either a bar graph or a pie chart. However, because we are not comparing parts of a whole and the percents do not add up to 100%, a bar graph is more appropriate.

10.2

The percent of the population receiving SNAP benefits rose sharply between 1970 and 1976, then remained relatively stable (rising and falling slightly) until 1994. From 1994 to 2000, there was a sharp decline, followed by a sharp increase in participation through 2014.