Polygraph is contructed to represent :
(i) Only one variable
(ii) Two variables only
(iii) More than two variables
(iv) None of the above
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(iv) none of the above
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A polygraph is constructed to represent two or more than two variables. It is a type of line graph which uses an equal number of lines( patterns are different) for convenient comparison of variables.
Example: Growth rate of various crops such as rice, wheat, maize, etc., birth/death rate, sex ratio in different states/countries, etc.
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