Listen to question, ask to repeat if needed take the time to think of your answers and answer what is asked of you
Know the job, look up job description
Ensure you have a good understanding of Computer Assisted Telephone Interviewing. Some of Statistics Canada's releases are mission critical, meaning that the public relies heavily upon the timely releases and accurate information provided in these releases, therefore you should be able to build good working relationships with the respondent to ensure that they provide the data on time. Also, you should demonstrate that you are organized.
They would hire a monkey from the zoo so don't stress over the interview questions, a 5 year old child could get through the initial interview.