2. A standard method for the determination of the carbon monoxide (CO) level in gaseous mixtures is known from many hundreds of measurements to have a standard deviation of 0.21 ppm CO. A modification of the method yields a value for s of 0.15 ppm CO for a pooled data set with 12 degrees of freedom. A second modification, also based on 10 degrees of freedom, has a standard deviation of 0.12 ppm CO. Is either modification significantly more precise than the original at the 95% confidence level?
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