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.
After buying the security system equipment, you'll have to pay for monthly monitoring, which can run from $15 to $100, but the average price is $30. Most home security systems require one to three-year contracts, although some companies, like SimpliSafe, don't require any.