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In nonprobability sampling , there is an inherent risk of sampling bias because the populations of interest may not be represented accurately . Parks identified for sampling are based on prior history of sampling , proximity to sources , degree of threat , requests from parks , importance of park , relationship to other parks or other sampling programs , and other factors . Afternoon Lab Tour ( 1315-1400 ) - - at my request , Andrea and Nancy give us a videotaped tour of the lab facilities and stored samples . It is used when the results from two independent random samples fall into one or the other of two mutually exclusive classes ( i.e ., defect versus good , or successes vs failures ) . Species are selected based on frequency and abundance in park , prior history of sampling , life form , relationship to other parks , presence / absence of an elemental baseline , and more . Since when using a double sampling plan the sample size depends on whether or not a second sample is required , an important consideration for this kind of sampling is the Average Sample Number ( ASN ) curve . He will measure several cytokines and cytokine-related proteins and genotypes in approximately 900 stored samples from WISE participants . The director , in determining for administrative purposes whether or not fertilizer materials are deficient in any of their component parts , shall be guided solely by the official sample as defined in section 3-262 , subsection B , and obtained and analyzed as provided in subsection A of this section . The objectives of this study were to compare the SPMD method of water sampling with sediment-based and fish biomonitoring-based methods .