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Sampling Interval is the inverse of sampling ratio. For instance, we want to sample 300 names from 900. After a random starting point, we select every third name of the 900 to get a sample of 300. The sampling ratio is 300/900 = 0.333 (or 33%) and the sampling interval is 1/0.333 which is 3.

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Q: How you can get a sampling interval from the sampling ratio?
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