There are 3 main types of bar charts.
When constructing a bar chart it is important to choose a suitable scale to represent the frequency.
Example :
The following table shows the number of visitors to a park for the months January to March.
Month |
January |
February |
March |
Number of visitors |
150 |
300 |
250 |
Solution:
a) If we choose a scale of 1:50 for the frequency then the vertical bar chart and horizontal bar chart will be as shown.
b) Increase in March compared to January isc) Percentage of visitors in February compared to the total number of visitors is
The double bar chart is used when we want to represent two sets of data on the same chart. We can put the bars side by side or we may put the bars of one set of data on top of the bars of the other set of data.
The choice of the forms of double bar chart – side by side or stacked, depends on the main purpose of the chart. A side by side chart is more useful when we compare the two sets of data (example: the number of adult visitors as compared to the number of child visitors); whereas the stacked chart emphasizes the totals of the two sets of data (example: total number of visitors).
Example :
The following frequency graph shows the number of adult visitors and child visitors to a park. Construct a side by side double bar chart and a stacked double bar chart for the frequency table.
Month |
April |
May |
June |
Number of adult visitors |
300 |
500 |
700 |
Number of child visitors |
200 |
600 |
600 |
Solution:
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