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Select the non-random sample selection method is based on the unit in general overall, not able to peer to be selected into the study sample. The non-random sample selection is entirely dependent on the experience and understanding of the totality of people should research results often subjective investigation of the research. On the other hand, we cannot calculate the error due to sample selection, therefore not able to apply statistical estimate method to the broad decline results on the model for general overall. Define a list of relevant categories of controls or quotas such as age, gender, income, or education. A quota is a specific requirement of the predefined entries. The first target population segment into the Group mutually, meaning that an individual may be a member of a catalog or group. for example: We interview the homemaker to purchase at the supermarket maximark at a time. so will a lot of housewives not to purchase at that time so will not likely be determined exactly.
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