Refer to the Following Partial ANOVA Results from Excel (Some

Multiple Choice

Refer to the following partial ANOVA results from Excel (some information is missing) . $$\begin{array} { | l | c | c | c | c | } \hline \text { Source of Variation } & S S & d f & M S & F \\\hline \text { Nozzle setting } & 3.46722 & 1 & 3.46722 & 4.87198 \\\hline \text { Pressure level } & 8.07444 & & 4.03722 & 5.67291 \\\hline \text { Interaction } & 2.80779 & 2 & 1.40389 & 1.97268 \\\hline \text { Error } & 8.54000 & & 0.711667 & \\\hline \text { Total } & 22.8894 & & & \\\hline\end{array}$$ How many pressure levels were observed?

A) 4
B) 3
C) 2
D) 1