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.
US spending on Middle East wars, Homeland Security will reach $4.79 trillion in 2017. Total U.S. spending on national security related to the post-9/11 war on terror has reached $3.6 trillion, and interest on funds borrowed to pay those bills could climb to $7.9 trillion by 2053.