Anexperimentthat was carried outtostudyhow flow rate through asolenoid valve in an automobile's pollution-control system depended on twofactors: spring load, and bobbin depth. Three different levels (ow,moderate,and high) of each factorwere chosen,and a single observation on flow was made for each combination of levels. The resulting data set consisted of how many observations? Please showhow you calculated yournumerical answer