If an examiner, inadvertently, allows three minutes extra time to some subjects in the group on a test of intelligence used in a research, this will introduce in the experiment

If an examiner, inadvertently, allows three minutes extra time to some subjects in the group on a test of intelligence used in a research, this will introduce in the experiment
1). Sampling error of random nature.
2). Measurement error of random nature.
3). Measurement error of constant nature.
4). Sampling error of constant nature.

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