The amount of flow through a solenoid valve in an automobile’spollution-control system is an important characteristic.An experiment was carried out to study howflow rate depended on three factors: armature length,spring load, and bobbin depth. Two different levels (lowand high) of each factor were chosen, and a singleobservation on flow was made for each combination oflevels. The resulting data set consisted of how manyobservations?

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