Bias is systematic error. Random error is not.
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I haven't been able to confirm the answer yet but here's what I believe: 'error and bias' in research terms questions the validity of the results you have found. If you are asked to relate error and bias to your research, they are asking you to share possible errors with the results and whether or not there could be any bias in the results collected.
Representative/random
It is important to make sure your random sample is random in order to make sure the results are accurate, and to prevent experimenter bias.
Scientific method
To prevent bias