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Question

The quality-control department at an automobile factory checks the tightness of motor-mounting bolts installed by assembly-line workers by sampling the first 25 cars produced by the assembly line each day. Explain why this sampling method is biased. Is this method likely to overestimate or underestimate the proportion of bolts that are improperly tightened?

Solution

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1 of 3DEFINITIONS

A $\textbf{voluntary response sample}$ is a sample for which the subjects can decide if they want to be in the sample or not.

$\textbf{Convenience sampling}$ uses a subgroup from the population, that is conveniently chosen.

$\textbf{Random sampling}$: selecting the sample from the population using some change process

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