Question

Question Help Assume that the sample is a simple random sample obtained from a normally distributed population of flight delays at an airport. Use the table below to find the minimum sample size needed to be 95% confident that the sample standard deviation is within 1% of the population standard deviation. A histogram of a sample of those arrival delays suggests that the distribution is skewed, not normal. How does the distribution affect the sample size? To be 95% confident that s is within 5% 10% 20% 30% 40% 50% of the value of the sample size 19.205 768 h should be at least 192 48 21 12 8 To be 99% confident that s is 1% 5% 10% 20% 30% 40% 50% within of the value of the sample size 33.216 1,336 336 85 38 n should be at least 14 The minimum sample size needed is 6 22

Answer 1

confidence level = 0.95, error is within = 1%, then from the given table

n = 19205

Answer

n = 19205

The distribution would not affect the sample size as the sample size is large, the central limit theorem holds.