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# Experiments and Variables Help (page 2)

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By — McGraw-Hill Professional
Updated on Aug 26, 2011

## Continuous Variable

A continuous variable can attain infinitely many values over a certain span or range. Instead of existing as specific values in which there is an increment between any two, a continuous variable can change value to an arbitrarily tiny extent.

Other examples of continuous variables are:

• Temperature in degrees Celsius.
• Barometric pressure in millibars.
• Brightness of a light source in candela.
• Intensity of the sound from a loudspeaker in decibels with respect to the threshold of hearing.

Such quantities can never be determined exactly. There is always some instrument or observation error, even if that error is so small that it does not have a practical effect on the outcome of an experiment.

Practice problems for these concepts can be found at:  Learning the Statistics Jargon Practice Test

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