An employer wants to determine the amount of job satisfaction experienced by his employees. Which sampling method is most likely to result in undercoverage?

Undercoverage happens when a sampling method leaves some groups out or makes them less likely to be represented. In choice C, the employer randomly selects only one pay scale and surveys everyone in it, so employees in the other three pay scales are excluded. The other methods select employees across the shifts, from the full set of identification numbers, or throughout the alphabetical roster.

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