The management of a large airline wants to estimate the average time after take-off taken before the crew begins serving snacks and beverages on their flights. Assuming that management has easy access to all of the information that would be required to select flights by each proposed method, which of the following would be reasonable methods of stratified sampling?
Select all that apply.
- For each day of the week, randomly select 5% of all flights that depart on that day of the week.
- Divide all flights into the following 4 groups on the basis of scheduled departure time: before 9:00 am, 9:00 am to 1:00 pm, 1:00 pm to 5:00 pm, and after 5:00 pm. Randomly select 5% of the flights in each group.
- For each crew member the airline employs randomly select 5 flights that the crew member works.
- Divide the airports from which the airline’s flights depart into 4 regions: Northeast, Northwest, Southwest, and Southeast. Randomly select 5% of all flights departing from airports in each region.
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