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01:22:52

Which shower would most likely be the control group in this

study?

Mildew is a fungus that grows in wet areas and can slowly

grow from microscopic to large stains in showers and sinks

Researchers are studying different sprays that could be used

to slow down the growth of mildew. They set up different

showers that are exactly the same and expose them each to

water with the same microscopic amount of mildew. They

then spray some showers with mildew-preventing sprays and

observe how fast mildew grows over time.

O the shower sprayed with many test sprays

the shower not exposed to any mildew at all

O the shower not sprayed with any mildew-preventing spray

O the shower sprayed with a test spray that is already

known to work