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Module 1: Graphs of all kinds

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Types of graphs

Writers and researchers use five different types of graphs to show the
data that they have collected and discussed. They might use either a column
or bar graph, a pie chart, a pictograph or a line graph to display the
trend in the changes in the data.

A pictograph compares frequencies using graphics of the objects being
counted - for example, the flavour of ice creams sold in the first 100 sold
at a beach van. In a column graph the frequencies and popularities are
compared with lengths of vertical columns - for example, for the number of
phone calls made each month throughout a year. A bar chart compares
frequencies with horizontal bars - for example, for the number of members
in each age group for a local tennis club. By comparison, a pie chart shows
how part of the data compares in size to the whole circle - for example,
how the population of London compares as a percentage of the total
population for all British cities. A line graph is typically used to show
trends by connecting data points with straight line sections - for example,
how the world population is increasing every fifty years.

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