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 20% of the population standard deviation. A histogram of a sample of those arrival delays suggests that the distribution isskewed, not normal. How does the distribution affect the samplesize?

To be95% confident that s is within

1%

5%

10%

20%

30%

40%

50%

of the value of , the sample size n should be at least

19,205

768

192

48

21

12

8

To be99% confident that s is within

1%

5%

10%

20%

30%

40%

50%

of the value of , the sample size n should be at least

33,218

1,336

336

85

38

22

14