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Systematic sampling is frequently chosen because it is a simple method . A type of sampling that is non-random is convenience sampling . Convenience sampling involves using results that are readily available . For example , a computer software store conducts a marketing study by interviewing potential customers who happen to be in the store browsing through the available software . The results of convenience sampling may be very good in some cases and highly biased -LRB- favor certain outcomes -RRB- in others .
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