It probably varies from recruiter to recruiter but for me there was a brief phone call with generic question and then finally interview with your to-be supervisor. The company has a high turnover rate so if you got an interview it's already decided that you're going to get an offer. Decide for yourself there.

I applied through the website, then there was a pre-screening by phone. If I passed, I was scheduled for an interview at the company. During the interview, I had to take a simple math test. After the interview, I was contacted by phone with an offer of employment.