Systematic Sampling

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Calculate

Example: a factory makes 500 parts per shift and wants to inspect 50. Instead of drawing all 50, it draws only the first and then takes one every k. Which parts are picked? Change the values to work out your own case.

Population size N Sample size n Random start r Between 1 and k. Blank: 1.

Step by step

What each term means

Sampling Interval (k): Every how many units one is taken. A start r is drawn between 1 and k, and the sample is r, r + k, r + 2k, and so on.
Population Size (N): How many units there are on the list, in the queue or on the production line.
Sample Size (n): How many units you want. When N/n isn't whole, the positions are rounded down and the interval varies between ⌊k⌋ and ⌈k⌉.