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A sample should reduce as much as possible elements of bias since they deprive statistical result of its representativeness. Define a bias and describe at...

      

A sample should reduce as much as possible elements of bias since they deprive statistical result of its representativeness. Define a bias and describe at least four examples of ways that bias is introduced in a sample.

  

Answers


Wilfred
Bias is a non-sampling error (error occurring during the process of gathering data) that is systematic and deprives a statistical result of its representativeness. It is cumulative as the sample size increases rather than balancing out like random errors.
Ways that bias is introduced include:
-Deliberate selection based on personal judgment of what is representative
- Having substitute members or units that are convenient rather than because of difficulty in making contact with given units.
- Failure to cover the whole of the selected sample like when some people do not answer questioners
- Haphazard selection by human beings rather than being random
- Inadequate, hasty, incomplete and misleading interviewing.

Sampling bias is tolerated in some investigations. Unbiased sample is one that is free from selection and
procedural bias
Wilfykil answered the question on February 20, 2019 at 11:42


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