_____________ occurs when some population elements are excluded from the process of selecting the sample.
A) Non-response
B) Error of observation
C) Undercoverage
D) Sampling error

Question

Quizplus · Accepted Answer

Undercoverage occurs when some population elements are excluded from the sampling process, leading to a biased sample. This can happen if certain subgroups within the population are not properly represented in the sampling frame or if the sampling method used does not have equal probability of selecting all units in the population. Non-response (A) refers to cases where selected individuals refuse to participate in the study, which can also bias the sample. Error of observation (B) refers to mistakes made during data collection, while sampling error (D) is the natural variation that occurs when we use a sample to estimate population parameters.

_____________ Occurs When Some Population Elements Are Excluded from the Process