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You also need to have an idea of the likely response rate you will achieve - this can be based on previous experience or your Geospend Account Manager can give you some guidance.
(0< likely response rate <=100)
Finally, you will need to decide on the acceptable level of accuracy that you required for your test. For example, do you require results that are within 0.5% either side of the anticipated response rate or do you need to be sure to within 0.2%?
(0< acceptable level <=1)
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