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Is Chart a visual display of numeric data?
Yes, a chart can be used to display numerical data.
Why did the student draw a bar chart rather than a line graph?
Your best chance of getting the correct answer is to ask the student who drew the chart. The type of chart/graph that is best drawn depends upon the data being represented: If the chart is being used to show how data represents a fraction of a whole, a Pie chart would be used. If the chart is of discrete data, eg shoe sizes, a bar chart would be used. If the chart is of continuous data, eg the height of people, a line chart would be used. A pictogram is a version of the bar chart with the bars split up into icons which represent some kind of unit; eg for shoe sales of different styles a shop could use a shoe icon to represent 5 shoes with parts of a shoe icon representing 1-4 shoes sold. In business which of the bar chart and line graph is used depends upon what sort of information is required to be shown and to whom*. For factual information about different items a bar chart is often used (eg how much is sales per month), but if a trend is required a line graph can be used (eg how is sales per month changing). * The "to whom" bit is often the deciding factor - the choice of chart and how it is drawn can be used to great effect to enhance or hide certain aspects of the data.
What is used to compare sets of data in one chart?
You can use a stacked bar chart.
Is there a chart for skewed data?
There isn't a specific chart for skewed data, but you could use a number of different charts to show that data is skewed. An Area chart could be used for example, or a column chart could also work. It would depend in the nature of the data.
What does a data series contain?
It is data that can be used in a chart. It can be values that are in cells in a worksheet.
