The Table Below Shows Raw Data on Air Pollutant Levels

Essay

The table below shows raw data on air pollutant levels (micrograms of particulate per liter of air) sampled at four different randomly chosen times of day on three different freeways. State the most reasonable hypotheses. What test would a statistician probably use? How many total degrees of freedom? How many degrees of freedom for the treatment(s)? How many error degrees of freedom? Explain. Do not do the F-test.

$\begin{array}{|c|c|c|c|c|}\hline \text { Lodge Freeway }&55.1 & 107.2 & 144.2 & 148.2 \\\hline \text { Chrysler Freeway}&42.8 & 128.2 & 97.1 & 144.2 \\\hline \text { Reuther Freeway }&75.1 & 76.1 & 102.2 & 82.1 \\\hline\end{array}$