A sample standard deviation for the number of passengers taking a particular airline flight is 8. A 95% confidence interval estimate of the population standard deviation is 5.86 passengers to 12.62 passengers.
a. Was a sample size of 10 or 15 used in the statistical analysis?
b. Suppose the sample standard deviation of s = 8 was based on a sample of 25 flights.
What change would you expect in the confidence interval for the population standard deviation? Compute a 95% confidence interval estimate of σ with a sample size of 25.