A professor at a large university wants to know if students prefer to take face-to-face classes or online classes. He gives an anonymous random survey to 50 students who attend his classes. Based on the responses, the professor constructs a 90% confidence interval where he determines the interval from 0.58 to 0.71 captures the true proportion of students who prefer to take face-to-face classes.Identify a potential source of bias that is not accounted for by the margin of error.
D
no obvious bias in the study designThe survey includes only students who attend the professor’s classes, so students elsewhere at the university may be left out or underrepresented. This is undercoverage, and the margin of error accounts for random sampling variability—not bias caused by an incomplete sample. The correct choice is undercoverage.
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