A random assignment means that an instructor assigns homework to her students every weekend

In a 2 X 2 between-subjects factorial design, we wish to run ten participants in each of the four cells. In total, we will need

A) 40 participants. B) 10 participants. C) 20 participants. D) 80 participants.

Which of the following is not a problem with regard to chemical or biological weapons?

a. Shifts in wind currents sometimes expose your own troops to the agents. b. Such weapons are expensive to build. c. They have to be delivered in mass quantities to have mass effects. d. They can be difficult to produce in a form that will have the desired effect.