When gasoline is pumped into a tank, hydrocarbon vapors are forced out and into the atmosphere. To reduce this significant source of air pollution, devices are installed to capture the vapor. In testing these vapor recovery systems, a "sniffer" measures the amount recovered. John Rice provided the data for the file sniffer.txt.
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source
John Rice
References
Weisberg, S. (in press). Applied Linear Regression, 4th
edition. Hoboken NJ: Wiley.