non response, in accurate response and selection bias
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Personal errors natural errors instrumental errors
Some of the reasons are: Systematic measurement errors. Random measurement errors. Poor use of equipment. Recording errors. Calculation errors. Poor plotting. Wrong model.
Sampling and Non sampling errors
These errors occur due to chance. These errors tend to cancel to each other in long run. These errors are random. They are not the results of any prejudice or bais.
Polio virus causes poliomyelitis.