Question: The federal test procedure (FTP) for determining the levels of various types of vehicle emissions is time-consuming and expensive to perform. According to the article "Motor Vehicle Emissions Variability" there is a widespread belief that repeated FTP measurements on the same vehicle would yield identical (or nearly identical) results. The accompanying data is from one particular vehicle characterized as a high emitter:

1. Compute the sample standard deviations for the \(\mathrm{HC}\) and \(\mathrm{CO}\) observations. Does the widespread belief appear to be justified?
2. The sample coefficient of variation \(s / \bar{x}\) (or \(100 s / \bar{x}\) ) assesses the extent of variability relative to the mean. Values of this coefficient for several different data sets can be compared to determine which data sets exhibit more or less variation. Carry out such a comparison for the given HC and \(\mathrm{CO}\) data.

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