Listed here are the six members of the Council of Oil and Petroleum Exporting Countries: Argentina, Bahrain, Colombia, Dubai, Ecuador, and Oman. You plan to take a sample of these member countries in order to estimate the group’s proven oil reserves. List all the equally likely samples if you use
a. Simple random sampling to choose a sample of size three. (You should list 20 samples.)
b. Systematic random sampling from the alphabetical list to choose a sample of size 3. (You should list two samples.)
c. Stratified random sampling to choose a sample of size four. You want to ensure that you end up with two Latin American countries and two Middle Eastern countries in the sample. (You should list nine samples.)

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