The management of a manufacturing firm wishes to determine the average time required to complete a certain manual operation. There should be 0.95 confidence that the error in the estimate will not exceed 2 minutes. What sample size is estimated if the standard deviation from a time-and-motion study is 16 minutes?
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Research methodology has come up 15 times in 4 exams since 2015.
This question is on Sampling methods and selection bias, part of Research methodology in Statistics.
How samples are drawn and how a poor method misleads.
TestStop has 7 past-paper questions on this subtopic.
Question from the UGC-NET 2025 paper. Solutions are TestStop's own. Not affiliated with or endorsed by any examination authority.