Sampling Sizes.

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Sampling Sizes.
Message posted by Vimal on September 29, 1999 at 12:00 AM (ET)

If i wish to do some sampling to determine the biomass of fish in an aquaculture cage with the normal standard deviation in weights....what sample size do i require to get 99% accuracy ?

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Re: Sampling Sizes.
Message posted by JG on September 29, 1999 at 12:00 AM (ET)

I presume you mean 99% confidence. You also have to determine the margin of error (+/-) and you have to guess the population standard deviation and decide if the population is very large in comparison with the sample.
The usual formulas assume a simple random semple is being considered. In any case all this theory only applies to probabilistic sampling. There is no sample size computation for judgement sampling or convenience sampling.

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