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Railways NTPC (Technical Ability) Metrology and Inspection Question Bank Metrology and Inspection

  • question_answer
    If one state occurred four times in hundred observations while using the work-sampling technique, then the precision of the study using a 95% confidence level will be:

    A) 90%                             

    B) 92%

    C) 95%                             

    D) 98%

    Correct Answer: D

    Solution :

    \[{{S}_{p}}=K\sqrt{\frac{p(1-p)}{N}}\] \[K=2\] for 95% confidence level \[S\times 0.04=2\sqrt{\frac{0.04\times 0.96}{100}}=0.0392\] \[S=0.98\,\,or\,\,98%\]


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