Financial analyst Larry Potts needs a sample of 100 securities listed on the Toronto Stock Exchange. The current issue of the Report on Business Magazine, has an alphabetical list of the 2,531 securities that are listed in the "Toronto Exchange Composite Transactions," an alphabetical listing of all securities traded on the previous business day. Larry randomly selects the 7th security as a starting point, and selects every 25th security thereafter (7, 32, 57, etc). His sample is a _. 0 simple random sample 0 stratied sample 0 quota sample 0 systematic sample 0 cluster sample