1 answer

Assume that the sample is a simple random sample obtained from a normally distributed population of...

Question:

Assume that the sample is a simple random sample obtained from a normally distributed population of flight delays at an airpo

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

Answers

Solution :

The sample size needed to be 95% confident that the standard deviation is within 30% of the population standard

deviation is  21 .

Option D)

.

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