What Is A Good Sample Size For Medical Research. The confidence interval is the plus-or-minus figure that represents the accuracy of the reported. If the researcher wants to incur low cost in the process smaller sample size will be preferred.
A good maximum sample size is usually 10 as long as it does not exceed 1000 A good maximum sample size is usually around 10 of the population as long as this does not exceed 1000. Jan 09 2019 If 200 to 400 patient charts is the maximum feasible sample size as is often the case in practice it can be expected that cost estimate 95 confidence intervals will be precise to within 515 of the mean depending on the ratio of standard deviation to mean costs. What is more important is whether 100 or 200 subjects are needed.
If the overall desired alpha level is 005 the sample size formula should be reduced to 005 6 00083.
There is nothing precise about a sample size estimate when designing studies. Sample size determination is one of the central tenets of medical research. For example in a population of 5000 10 would be 500. With a range that large your small survey isnt saying much.
