3) Identifique los elementos en uno mapa conceptual la funcion de los dispositivos externos respuesta por favor​

The double-blind procedure is most for a.random assignment b.the placebo effect c.operational definitions replication d. standard deviations

The law of inertia states objects that are moving continue to move, and alternatively objects that are static remain static, unless in both instances the objects are acted upon by another force

Which of these was not a direct result of the invention and subsequent use of eli whitney's cotton gin in 1793?