A researcher studying the attitudes of college students on social norms posts a survey on her webpage. After receiving 150 responses she closes the survey and analyzes the results by comparing the results against those of a study conducted in the campus library. What error has the researcher likely committed?

Selection Bias

Explanation: Selection Bias is a research error usually caused by improper randomization of data used to perform an experiment.

In the scenario above, has likely committed a selection bias error has the number of responses used in her analysis isn't properly randomized, In other words, the sample isn't representative of the population. The researcher should have allowed for a larger number of responses then chosen the required number of responses( sample) at random in other to obtain observation representive of the population.

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