Why is it important to ensure that a population sample isunbiased? In your own w

Why is it important to ensure that a population sample isunbiased? In your own words give an example in detail of how youwould obtain an unbiased sample using one of the techniques listedbelow. Include two or three precautions you would take to insurethat the sample is as unbiased as possible. (Remember to selectonly one.) Systematic sampling Cluster sampling Stratified sampling