The sample is of little use in making estimates for the population as a whole unless it is known exactly how it is non-representative.
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Disadvantages of systematic sampling: © The process of selection can interact with a hidden periodic trait within the population. If the sampling technique coincides with the periodicity of the trait, the sampling technique will no longer be random and representativeness of the sample is compromised.
Sampling has several disadvantages. These include time consuming and tedious. Possibly, members of units are different from one another, thus decreasing its effectiveness.
You do not have all the information and so your conclusions are based on approximations.
Mostly can be biased and in some cases can choose people/units innapropriate for the circumstances
1).There may errors (Producer's and Consumer's risk) associated with the sampling. 2).The sample does not provide 100% accurate information of the condition of the bacth.