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Question
Polygraph is constructed to represent ______.
Options
Only one variable.
Two variables only.
More than two variables.
None of the above.
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Solution
Polygraph is constructed to represent more than two variables.
Explanation:
A polygraph is a multiple-line graph designed to show and compare more than two variables at the same time on a single chart. It uses multiple lines, each drawn in a different colour or pattern (e.g., solid or dotted), to track different datasets over the same time period. For example, a single polygraph can easily display the birth rate, death rate, and natural growth rate of a state together, allowing you to instantly compare all three trends at a single glance.
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