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3 cards from this section. Quick, good the night before a test.
What is a bar graph used for?
Think about comparing different quantities of things.
Define a histogram.
Consider how you might group data points into ranges.
What is the main purpose of a bar graph?
Remember what type of data bar graphs are best for.
True or False: Histograms have gaps between the bars.
Think about how histograms differ from bar graphs.
Given the marks of students: (0-20: 3, 20-40: 8, 40-60: 15, 60-80: 10), draw a histogram and frequency polygon.
Consider the widths of your bars when plotting your histogram.
Analyze the effects of changing the intervals in a histogram for a class's test scores on the visibility of data trends.
Think about how wider or narrower intervals would display your information.
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