Identify the sampling method. Then identify any bias in each method. And show all work

A maintenance crew wants to estimate how many of 3000 air filters in an office building need replacing. The crew examines five filters chosen at random on each floor of the building.

3 answers

@oobleck
Plse help

@mathhelper

sorry, not too up on statistical methods.
But surely by now you have managed to ferret out an answer...

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