Solved by a verified expert :Hello class,
Recently, one of my administration guys put out a survey that he came up with. The sample was based off voluntary clustered sample by him placing the survey into selective people mail boxes asking them to respond. This was an improper sample because he only done this for his district. Therefore, the only response he got were the ones that he knew had strong feelings in reference to his survey. Instead, he should have placed this survey across the city. That way he could get a good randomized sample on the survey instead of getting his select few. Now we all knew this was done on purpose so that he could persuade the right people about his survey. However, his survey was decided to be faltered because he did not allow the entire city to place their opinions in the matter.If he would have used simple random sample across the five districts then he could’ve gotten a proper sample from a non selected group and could have produce better results.
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