margins of error and confidence intervals
1) Explain why this data is a population, rather than a sample. Remember that we can generally describe a population using a phrase like, this is a list of all of ___________.
2) Like last weeks exercises, well calculate confidence intervals using random samples of this data. Choose 20 rows at random. Find the standard deviation of depdelay of your 20 selected flights. Is this standard deviation a sample standard deviation (s) or population standard deviation ()?
3) Based on your findings in (2), calculate a confidence interval for the average flight departure delay at 95% confidence level, being sure to show your calculations clearly. Explain why you used (or did not use) the finite correction factor to calculate your margin of error.
Hint 1: If youre using Word, Insert > Equation will make your life easier as you show your work.
Hint 2: To decipher airport and carrier codes (including Salem, Southwest airlines and many others), click on this .
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