Need help with this problem! I tried 1. Cluster 2. Stratified 3. Systematic 4. C

Question

Need help with this problem!
I tried 1. Cluster 2. Stratified 3. Systematic 4. Convenience
But it was not the correct answer. Need help with this statistics problem. Thank you in advance for your time! Determine whether the following should be classified as simple random, systematic, convenience, stratified, or cluster sampling. # 1 . All students from several dorms are asked to complete a questionnaire 2. Ten students from every 8:00 MWF math class at Tech are selected to complete a survey 3. Every 15th person who enters a local store is selected and asked questions regarding the cleanliness of the store 4. Every student in two different 8:00 classes on Tech's campus is selected to complete a survey

Explanation / Answer

1:

Here doms are clusters.

Each student from the selected clusters (doms) particiaptes in the survey. So it is an example of cluster sampling.

2:

Yes it startifid sampling. Each 8:00 MWF class is a strata.

3:

Systematic sampling

4:

It is also cluster sampling. 8:00 classes are cluster.

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