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The standard deviation of the pollution by products reaked ed in the burning of 1 gallon of gas is 2.3. A random sample of 20
The standard deviation of the pollution by products reaked ed in the burning of 1 gallon of gas is 2.3. A random sample of 20 automobiles tested produced a standard deviation of 1.9 ounces. is the standard deviation less than previously thought? use alpha = 0.05
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