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 99% confident that the sample standard deviation is within 40% 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 thats is within of the value of 6, the sample size 19.205 768 In should be at least To be 99% confident that s is within of the value of o, the sample size n should be at least 1% 5% 10% 20% 30% 40% 50% 192 48 21 12 8 1% 5% 10% 20% 30% 40% 50% 33,218 1,336 336 85 38 22 14 The minimum sample size needed is

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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 99% confident that the sample standard deviation is within 40% 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
of the value of o, the sample size
n should be at least
To be 99% confident that s is
within
of the value of o, the sample size
n should be at least
1%
5%
10% 20% 30% 40% 50%
19.205 768
192
48
21
12
8
1%
5%
10% 20% 30% 40% 50%
33,218 1,336 336
85
38
22
14
The minimum sample size needed is
Transcribed Image Text: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 99% confident that the sample standard deviation is within 40% 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 of the value of o, the sample size n should be at least To be 99% confident that s is within of the value of o, the sample size n should be at least 1% 5% 10% 20% 30% 40% 50% 19.205 768 192 48 21 12 8 1% 5% 10% 20% 30% 40% 50% 33,218 1,336 336 85 38 22 14 The minimum sample size needed is
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