That caveat is important: In March, ICE used a Stingray variant known as a Hailstorm to locate 20-year-old El Salvadorean man Rudy Carcamo-Carranza, who had entered the US illegally twice and was wanted in connection to alleged drunk driving and hit-and-run incidents. The ICE officer involved in the investigation, Jeremy McCullough, was a member of the ERO department but was also assigned to the FBI’s Violent Gang Task Force. So for ICE agents to use a cell-site simulator to track people suspected of immigration law violations, they just need to be assigned to such a unit.
An important advantage of the two-way ANOVA is that it is more efficient compared to the one-way. There are two assignable sources of variation – supp and dose in our example – and this helps to reduce error variation thereby making this design more efficient. Two-way ANOVA (factorial) can be used to, for instance, compare the means of populations that are different in two ways. It can also be used to analyse the mean responses in an experiment with two factors. Unlike One-Way ANOVA, it enables us to test the effect of two factors at the same time. One can also test for independence of the factors provided there are more than one observation in each cell. The only restriction is that the number of observations in each cell has to be equal (there is no such restriction in case of one-way ANOVA).