Question

what is random error?

Answer 1

What is Random Error?
Random error is caused by any factors that randomly affect measurement of the
variable across the sample. For instance, each person's mood can inflate or deflate their performance on any occasion. In a particular testing, some children may be
feeling in a good mood and others may be depressed. If mood affects their
performance on the measure, it may artificially inflate the observed scores for some
children and artificially deflate them for others. The important thing about random error
is that it does not have any consistent effects across the entire sample. Instead, it
pushes observed scores up or down randomly. This means that if we could see all of
the random errors in a distribution they would have to sum to 0 -- there would be as
many negative errors as positive ones. The important property of random error is that it
adds variability to the data but does not affect average performance for the group.
Because of this, random error is sometimes considered noise.


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Answer 2

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The Random errors are those errors, which occur irregularly and hence are Random with respect to sign and size.

These can arise due to random and unpredictable fluctuations in experimental conditions.

Eg :- Unpredictable fluctuations in temperature, Voltage supply, mechanical vibrations of experimental set-ups, etc, personal errors by the observer taking reading, etc.

For eg :- When the same person repeats the same observation, it is very likely that he may get different readings everytime.

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