What to do if the selected respondent selected after doing a randomized sampling method will decline to answer?

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David Eugene Booth

Always take more than the specific n you computed. This happens a lot so be sure to take plenty. Best wishes David Booth

Daniel Wright

You will need to explore if the reasons for missing are similar for the groups from you randomization.

Gioacchino de Candia

When a random sample of size n is extracted, it is good to keep in reserve another series of extractions (always extracted with the same method) with which to replace any missed answers / falls.