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.
1 There are no fixed charges for obtaining a security clearance. 2  The price could range from a few hundred dollars to a few thousand dollars. 3  Among the various types of security clearance, the top level one is the most expensive. 4  Such a clearance could cost about $10,000 or more, including all the other fees.