- Sun Jul 24, 2011 7:26 pm
Did you get a chance to read the explanation of the drill in the answer key? It's fairly extensive, and the introductory portion specifically discusses the complex interaction of the second rule and the last rule, and understanding that interaction is essential to correctly answering question #6.
In short, even though G is a random, if you attempted to select just D and G, then none of the other variables would occur. But, take a look at the second rule—when B doesn't occur, either H or I occurs. Thus, you cannot have just D and G occur.
Remember, in grouping, it's not just the variables that are selected that can make things happen, but the unselected variables can also have an impact. If a rule contains a negative sufficient condition (as is the case in the second rule), when that condition is met (in this case, B is not selected)then something else must occur (H or I occur).
Take a look at that explanation and please let me know if that makes sense. Thanks!