A self-selected sample survey is when the surveyer choses who he or she wants to ask the survey question to. So, the people surveyed are not random at all. One problem with this is that the surveyer can easily manipulate results by asking a group of people specifically to get a certain result. For example, if I wanted to do a survey about abortion, and I wanted the results to be in favor of my liberal views, I might only survey people in a liberal coffee shop in Seattle. This is a self-selected survey.
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A convenience survey or a self-selection survey is most likely to be affected by bias
The answer depends on what information the survey collects.
It is because the sample size for the second survey was larger.
Random selection.
survey the people who used the product. -apex