In: Statistics and Probability
Determine whether the following should be classified as simple random, systematic, convenience, stratified, or cluster sampling.
1. Church members are each assigned a number and then a random-number table is used to select the members who will complete the survey
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. Five students from every dorm on campus are selected
1)
In this situation , each church has equal number of chance to include in sample and sample point selecting using random numbers. So this is example of simple random sampling.
2)
In this situation , math classes are working as clustors and we are selecting sample points from then each clustor .
This is example of clustor sampling.
3)
In systematic sampling we include population units with number n, n+k , n+2k....... In given example we are using such technique to select sample points.
So this is example of systematic sampling .
4) suppose each dorm has equal number of students .
Then in such situation dorms working as groups ( strata) and we are selecting five students from each dorm . So this is an example of stratified sampling.