The amount of flow through a solenoid valve in an automo- bile's pollution-control system is an significant characteristic. An experiment was carried out to study how flow rate depended upon three factors: armature length, spring load, and bobbin depth. Two different levels (low and high) of each fac- tor were chosen, and single observation upon flow was made for each combination of levels.
A. the resulting data set consisted of how many observations?
B. Is this an enumerative or analytic study? Explain your reasoning.