A materials engineer wants to study the effects of two different processes for sintering copper (a process by which copper powder coalesces into a solid but porous copper) on two different types of copper powders. From each type of copper powder, she randomly selects two samples and then randomly assigns one of the two sintering processes to each sample by the flip of a coin. The response of interest measured is the porosity of the resulting copper. Explain what type of study this is and why.