The department hires very less graduate students each semester. Usually acceptance rate is high in the Fall semester. There is no such interview process other than submitting our academic certificates and CV and statement of purpose to the graduate school as well as to the department. They screen out you from several applicants and let you know whether you got the admission or not.

you apply via online portal of respective department. if you meet qualifications they will give you position. maintaining 3.0 GPA is must. If you maintain higher GPA than 3.0 its great as it gives you benefit in next terms selection process