A new web site, RateThyProfessor.com, has 24 evaluations for a certain mathematics professor. 8 of the 24 evaluations are very bad, 1 out of a rating of 5, and all 8 of these bad evaluations mention a certain semester at the beginning of the pandemic.

What type of bias is most likely to occur in this data collection method used?

Question

A new web site, RateThyProfessor.com, has 24 evaluations for a certain mathematics professor. 8 of the 24 evaluations are very bad, 1 out of a rating of 5, and all 8 of these bad evaluations mention a certain semester at the beginning of the pandemic.

What type of bias is most likely to occur in this data collection method used?

BlackTom AI · Accepted Answer

First, let's restate the scenario to ensure we understand what the data represent and what information might be missing. A new website collected 24 evaluations for a mathematics professor, where 8 are very bad, 1 is rated 5, and all 8 bad evaluations mention a specific semester at the beginning of the pandemic. The question asks about the type of bias most likely present in this data collection method.

Consider the implication of having 24 evaluations with a large cluster of negative reviews tied to a single semester. This pattern suggests that the data are not a random sample of opinions taken across all semesters or all students. Instead, there is a strong link between the time period in which the course occurred (the beginning of the pandemic) and the likelihood of a student submitting a negative evaluation. Such a pattern points to a bias introduced by who chose to respond and when they chose to respond, rather than reflecting the professor’s typical performance across all semesters.

Option: Response bias. This occurs when respondents provide feedback that is not representative of their true opinions due to the method of data collection, wording, or recall, or because only certain individuals chose to respond. In this scenario, the clustering of negative evaluations tied to a specific semester implies that those with strong negative experiences were more motivated to leave feedback, while others may have abstained. This selective response skews the results toward negative assessments, which is a hallmark of response bias.

Now, explore why other potential biases are less fitting given the details, to sharpen the reasoning without asserting a conclusion too quickly:
- Selection bias would involve nonrandom selection of which students or evaluations are included in the sample, leading to a non-representative group. While related, the key feature here is the overrepresentation of negative responses tied to a specific event, which points more directly to an issue with who chooses to respond rather than just who is included in the sample.
- Nonresponse bias is a close cousin to response bias, occurring when those who do not respond differ systematically from those who do respond. If the data show a lot of bad feedback specifically from a particular semester, nonresponse bias could contribute, but the explicit link to the pandemic semester emphasizes respondent behavior (who chose to respond) as the core mechanism.
- Recall bias is about inaccuracies in memory affecting responses, common in retrospective surveys. In this academic setting where evaluations are recent and about a course quality, recall bias is less likely to be the primary driver compared to the reaction-based decision to leave a review.
- Measurement bias arises from faulty instruments or questions that skew results. Here, there is no indication of flawed questions or scoring scales; the problem described is not about how feedback was measured, but about who provided feedback and when.
- Observer bias involves the researcher’s expectations shaping data collection or interpretation. Since the data are user-submitted evaluations on a website, this form of bias is unlikely unless moderators influenced submissions, which isn’t indicated.

Putting these threads together, the strongest fit for the described pattern is that the data reflect a response bias: the data are disproportionately composed of responses from individuals who had a particularly strong (negative) experience linked to a specific time period, rather than a random or representative cross-section of all evaluations.

In summary, the observed concentration of very bad evaluations associated with the pandemic semester signals response bias, since the method of collecting responses appears to have elicited a non-representative sample of opinions driven by the respondents’ motivation to voice a negative experience during that period.

STAT 130-007 Chapter 8 & 12 Quiz

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