← Applied Mathematics and BiostatisticsBMS 1110 · PracticeLanguage

246-question practice bank

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Question 1 of 8Section 6.3 · Sampling, estimation and inferenceMedium

A lecturer surveys the students in her own class to estimate the average weekly study time of all 4,000 students in the faculty. Which statement is correct?This is sampling bias: one class is a convenience sample that systematically excludes most of the target population, so the estimate is pushed in a fixed direction.This is only random error: the estimate is unbiased but imprecise, and a larger class would repair it.There is no bias, because every student present was asked and none was left out.There is bias only if the class contains fewer than 30 students.

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