# Determining Sample Size. In Exercises 1–4, assume that each sample is a simple random sample…

Determining Sample Size. In Exercises 1–4, assume that each sample is a simple random sample obtained from a normally distributed population. Use Table 7- 2 on page 376 to find the indicated sample size.1. 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?2. Find the minimum sample size needed to be 95% confident that the sample standard deviation s is within 30% of σ.Is this sample size practical in most applications?3. Find the minimum sample size needed to be 99% confident that the sample variance is within 40% of the population variance. Is such a sample size practical in most cases?4. Find the minimum sample size needed to be 95% confident that the sample variance is within 20% of the population variance.Table 7- 2