Find the minimum sample size needed to be 95% confident that the sample standard deviation s is within 1% of σ. Is this sample size practical in most applications?

Assume that each sample is a simple random sample obtained from a normally distributed population. Use Table 7-2 to find the indicated sample size.

Transcribed Image Text:

6 To be 95% confident that s is within of the value of a, the sample size n should be at least To be 99% confident that s is within of the value of 6, the sample size 33,218 1,336 336 85 n should be at least 5% 10% 20% 30% 40% 50% 1% 19,205 768 192 48 21 12 1% 5% 10% 20% 30% 40% 50% 38 22 14 8