I labeled #20 as "sufficient assumption" because it asked for a statement to "complete" the argument. However, the psychiatrist's argument only needs to be "strongly supported," so I guess the answer choice doesn't have to make the argument watertight.

Look at each answer choice individually; don't carry over ideas from previous ones. And don't over complicate the answer either: figure out the base of what you're looking for and stick to that.

When making comparisons, such as in answer choice A, make sure that samples are comparable and cannot be easily explained by another factor (i.e. men vs women can have differing rates of heart disease for reasons other than wine consumption; better to compare samples that control only for your topic of interest). Also, it is important to accept answer choices as true and at face value (i.e. if it says people will get more liver disease, assume that claim is supported).

Since North Americans, in their "natural environment," on average tend to eat an excess of food, obese lab rats out of their natural environment could be a reasonable model. Thus, the conclusion that the experiment is designed poorly because the lab rats are out of their respective natural environment cannot be supported.

I need an accountabilibuddy for the February 2015 exam. I have been studying a little this last month, but am just starting the 7Sage course, so I'm still figuring out the best way to use their program. Let me know what you have in mind.