Assume that the sample is a simple random sample obtained from a normally distri

Question

Assume that the sample is a simple random sample obtained from a normally distributed population of fight delays at an airport Use the table below to find the minimum sample size needed to be 99% con ent that the sample standard deviation s within 20% of the populaton standard deviat r A stgam orasa ple of hose a valdei ugms that the distribution is skewed, not normal. How does the distribution affect the sample size? To be 95% confident that s is within | 10-20% | 30% | 40% | 50% 1 of the value of o, the sample size n 19,205 768 192 48 21 18 should be at least The minmum sample size needed is histogram of a sample of those arrival delays suggests that the distribution is skewed, not normal. How does the distribution afflect the sample size? 0 A. The computed sample size should be multiplied by 2. Click to select your answerts). Previous Next

Explanation / Answer

a) Minimum Sample size for 99% confident that standard deviation is within 20% of the population standard deviation

= 85

b) Computed sample size likely to be correct because by central limit theorem accuracy increases as the Sample size increases

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