Question

Polygraph is constructed to represent ______.

Options

• Only one variable.

• Two variables only.

• More than two variables.

• None of the above.

Answer 1

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.