specify different types of variables and constant with example
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TL;DR: In a science experiment, the controlled or constant variable is a variable that does not change. For example, in an experiment to test the effect of different lights on plants, other factors that affect plant growth and health, such as soil quality and watering, would need to remain constant.
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VARIABLE
A variable is something that may change in value. A variable might be the number of words on different pages of this booklet, the air temperature each day, or the exam marks given to a class of school children.
Example
REAL FRACT, MEAN, STDDEV
Characters
Character variables contain one or more characters, (for example G or OXFORD).
The general forms are:
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