An experiment is conducted to investigate how the addition of a surfactant affects the ability of magnetized steel wool to remove uranium-oxide particles from water. Six batches of uranium-oxide contaminated water are obtained that are each split in half, and the surfactant is added to one of the two halves for each batch. The uranium-oxide levels are measured for each of the resulting 12 samples of water both before and after they are passed through some magnetied steel wool, and the reductions in the uranium-oxide levels are calculated. The resulting data set is shown in DS 9.2.9. Perform a hypothesis test to investigate whether this experiment provides sufficient evidence for the experimenter to conclude that the addition of the surfactant has an effect on the ability of magnetized steel wool to remove uranium-oxide particles from water.