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Random errors - Random errors can be evaluated through statistical analysis and can be reduced by averaging over a large number of observations. Systematic errors - Systematic errors are difficult to detect and cannot be analyzed statistically, because all of the data is off in the same direction (either to high or too low). Spotting and correcting for systematic error takes a lot of care.
sources of errors encountered in measurment
Sampling and Non sampling errors
Personal errors natural errors instrumental errors
please give me the answer of sources of error in person perception