Both cluster and stratified sampling rely on sub-groups in the ...

[Redwolflake15]

Both cluster and stratified sampling rely on sub-groups in the population. If the sub-groups are all very similar (they can all be considered mini-populations), which sampling method would be preferred?

Question 2

These questions pertain to how to collect a random sample of 800 airline passengers from 100 particular flights leaving San Francisco International Airport. Assume there are 200 passengers aboard each flight. Describe how to draw the sample as a systematic sample from these flights.

[leeeep]

Answer to Question 1

Cluster sampling is the preferred method.

Answer to Question 2

A numbered list of all 100x200 = 20,000 passengers on these flights could be obtained. For a systematic sample, one should be drawn from each set of 20,000/800 = 25 passengers. Randomly choose among the first 25 passengers on the list to start, and then choose every 25th passenger until 800 passengers were obtained.