researcher will either use random assignment or matching What do random assignment and matching have in common? They are both designed to create equivalent groups of participants. Random assignment is to random selection as _____ is to _____
1 An unarmed guard from 21st Sentry Security in Dallas-Fort Worth typically costs $14 per hour, while an armed guard starts at $18 per hour. 2  The time of day also affects pricing. 3  Security guards working at a late-night party in the city may cost $30-$50 per hour, for example.
Typical costs: 1  A stand-alone Internet security camera that sends images to your web browser starts around $30-$50, but expect to pay $75-$250 for a useable basic camera, and it can be $300-$1,000 and up for a high-resolution, durable-construction model. If you want the deterrence value without the need to actually watch or record anything, realistic-looking fake (dummy) security cameras can cost $15-$50 each.