Question

Under which method of data collection personal bias is possible ​

Answer 1

answer:-

Stratified sampling.....

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Answer 2

Under the method of sampling personal bias takes place.

• Quota sampling represent a method of non-probability sampling, where sample involving individuals representing a population is generated by researchers. The entire population can be generalised by these selected samples.
• Uncontrolled quota sampling does not place any limits on the choice of samples by the independent researcher. Here, at will, the researcher selects sample participants.
• If the sample has been unselected by means of random selection, it is difficult to determine a potential sampling error.  
• The conscious choice of units to be properly used in the extensive survey can also be based on ease of access and cost considerations, resulting in bias.