In determining the method of sampling,samples should be chosen to be as heterogeneous as possible so that each sample reflects the system of common causes or assignable causes that may be present at that point in time.

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Samples should be chosen to be as homogeneous as possible so that each sample reflects the system of common causes or assignable causes that may be present at that point in time. By minimizing the variability within the sample, it becomes easier to identify the cause of any variation and implement appropriate corrective actions.

In Determining the Method of Sampling,samples Should Be Chosen to Be