, 3. The management of a large airline wants to estimate the average time after takeoff 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
o 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.
4. To study the mean respiratory rate of all people in his state, Frank samples the population by dividing the
residents by towns and randomly selecting 12 of the towns. He then collects data from all the residents in
the selected towns. Which type of sampling is used?
Select the correct answer below:
Convenience sampling
Systematic sampling
Stratified sampling
Cluster sampling
5. When is stratified sampling appropriate?
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller chamberlain_university. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $15.49. You're not tied to anything after your purchase.
