Question

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 30% 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 1% 5% 10% 20% 30% 40% 50% of the value of o, the sample size In should be at least 19,205 768 192 48 21 12 8 To be 99% confident that s is within 1% 5% 10% 20% 30% 40% 50% of the value of 6, the sample size 33,218 1,336 336 85 38 22 14 In should be at least 0 The minimum sample size needed is 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? O A. The computed sample size should be multiplied by 2. OB. The computed sample size should be divided by 2. OC. The computed minimum sample size is likely correct. OD. The computed minimum sample size is not likely correct.

Answer 1

soldon: from the given 0 information 95%. Confidence interval that sample Handband standard deviaton within 30% deviaton, Sample size populator (from gives more) 5 2/ not likely The computed minimum Sample 57 Correct Topten o because, sample size is calculated basis normality assumption whereas in this Scenovo the normality assumpton 15 violated since dista buton s 512 wed