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?

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.