Mathematics, 22.02.2021 18:00 anthonylopez1

The Apple Company wants to investigate the defect rate of iPhones. So, Apple tests every 10th phone off the production line. Is this a biased or unbiased way to test phones
biased, because they aren't testing each phone
unbiased, because they are randomly choosing every 10th phone
biased, because they are only testing Apple phones
unbiased, because they need to make sure phones are working

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