A consumer interest group is tracking the percentage of household income spent on gasoline over the past 30 years. Which graphical display would be more useful, a histogram or a time-series graph. Why? a. A histogram because the change in data over time is the most relevant issue. b. A time-series graph because the change in data over time is the most relevant issue.     c. A time-series graph because the range of values for the data is the most relevant issue. 6. A histogram because the range of values for the data is the most relevant issue.

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Bar Graphs

A bar graph is a chart or graphical representation of data. A bar chart, also known as a bar graph, is a graph or chart that displays categorical data using rectangular bars with heights or lengths equal to the values they represent. Typically, bar graphs show categorical and numerical variables grouped in class intervals. A bar graph is useful for comparing and analyzing a set of data.