Noise pollution is measured in decibels. In Nevada any motorcycle made after 1980 may not be any louder than 80 decibels. Kawasaki claims the mean decibel rating on motorcycles is 70.0 with a variance...

Noise pollution is measured in decibels. In Nevada any motorcycle made after 1980

may not be any louder than 80 decibels. Kawasaki claims the mean decibel

rating on motorcycles is 70.0 with a variance of 10. The variance of the noise is questioned.

because Kawasaki has a mean that is less than 80, they could still be producing louder than

acceptable bikes. The federal EPA conducts a sample of 30 bikes and determines the

variance to be 20 decibels. Is there enough evidence to question Kawasaki claim of 10

decibels?

With the Hypothesis Test Method?

Jun 10, 2022

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