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

The question describes a data collection scenario where 24 evaluations exist for a mathematics professor on RateThyProfessor.com, with 8 very bad evaluations, 1 rating of 5, and all 8 bad evaluations mentioning a specific semester at the beginning of the pandemic.

First, let me restate the scenario: a web-based evaluation site has a small, specific sample of ratings that are all clustered around a particular time frame and a subset of respondents whose opinions are extreme enough to post negative reviews. The task is to identify the type of bias most likely to occur in this data collection.

Now, without a list of answer choices to examine, I’ll explain why the stated correct answer—response bias—fits best:
- Response bias occurs when the responses received are not representative of the population because those who choose to respond differ systematically from those who do not respond. In online ratings, individuals who feel strongly (often negatively) about a course or instructor are more likely to post a review, especially after a notable event like the onset of a pandemic semester. This can skew the data toward more extreme views and an overrepresentation of certain sentiments.
- The observation that the bad evaluations all mention a particular semester reinforces the idea that the timing and context influenced who chose to respond, rather than a random or representative sampling of all students who evaluated the professor. This temporal clustering suggests respondents with negative experiences were disproportionately represented, which is characteristic of response bias.
- If we were considering nonresponse bias, we would emphasize that some individuals did not respond at all, and their absence could distort the overall assessment. However, the key element here is that the respondents themselves are not representative because those with strong, possibly negative experiences are more likely to contribute, which aligns with response bias.
- Other common biases (like selection bias, sampling bias, or recall bias) could play roles in various contexts, but given the description—voluntary online ratings with evident clustering around a pandemic semester—the most apt label remains response bias, since the data reflect who chose to respond rather than a random cross-section of all evaluations.

In the absence of additional answer choices to critique directly, this explanation connects the observed pattern (several very bad evaluations tied to a specific time) to the mechanism of response bias, illustrating why the data are likely not representative of the professor’s overall performance across all students and time periods.

STAT 130-007 Chapter 8 Quiz

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