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Course: High school statistics>Unit 5

Lesson 3: Sampling methods

Systematic random sampling

In a systematic random sample, we arrange members of a population in some order, pick a random starting point, and select every member in a set interval. Created by Sal Khan.

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• Why is it important to randomly pick the first person? Can't we just simply pick every 100th person, for example? Why would that be biased?
• While that isn't super important we are just doing our best to get rid of all types of bias that could occur. In this case, we might be afraid that some time of bias could arise starting on intervals from the first "person" or "item".

Hope this helps. :-)
• Would systematic random sampling have bias like convenience since you are just at the front gate? Could you have two survey checkpoints were other people get surveyed?
• Good point! I suppose this example only refers to one entrance gate. Hopefully helped!
• Do you just randomly choose any?
• Any what? Please specify so that I can help. Thanks!
• , if the k=37, shouldn't we be surveying the next 37th person instead of the next 100th?