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Determining sample size

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A researcher is interested in estimating the noise levels in decibels at area urban hospitals. She wants to be 90% confident that her estimate is correct. If the standard deviation is 4.13, how large a sample is needed to get the desired information to be accurate within 0.68 decibels?

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Solution Summary

Solution describes the methodology to determine sample size in the given scenario.

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Given,

Margin of error=E=0.68 decibels

Population Standard ...

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  • BEng (Hons) , Birla Institute of Technology and Science, India
  • MSc (Hons) , Birla Institute of Technology and Science, India
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