Finding Sample Size Instead of using Table 7-2 for determining the sample size required to estimate a
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Finding Sample Size Instead of using Table 7-2 for determining the sample size required to estimate a population standard deviation s, the following formula can be used:
where za>2 corresponds to the confidence level and d is the decimal form of the percentage error. For example, to be 95% confident that s is within 15% of the value of s, use za>2 = 1.96 and d = 0.15 to get a sample size of n = 86.
Find the sample size required to estimate s, assuming that we want 98% confidence that s is within 15% of s.
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Related Book For
Biostatistics For The Biological And Health Sciences
ISBN: 9780134039015
2nd Edition
Authors: Marc Triola, Mario Triola, Jason Roy
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