Question: following partial ANOVA results from Excel (some information is missing). Source of Variation SS df MS F Nozzle setting 3.46722 1 3.46722 4.87198 Pressure level

following partial ANOVA results from Excel (some information is missing). Source of Variation SS df MS F Nozzle setting 3.46722 1 3.46722 4.87198 Pressure level 8.07444 4.03722 5.67291 Interaction 2.80779 2 1.40389 1.97268 Error 8.54000 0.711667 Total 22.8894 How many pressure levels were observed? Multiple Choice 4 3 2 1

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