You see a description of a study with the following annotati…

You see a description of a study with the following annotations for its design:  Group A:   R   O1         X      O2 Group B:   R   O3                  O4 What are the conditions necessary for this to be considered a “true experiment” and does this design meet these conditions?  

 Suppose you are considering buying another slice of pizza….

 Suppose you are considering buying another slice of pizza. The first slice of pizza you bought was $2, but because you were so hungry, you would have been willing to pay as much as $5 for it. The second slice was also $2, but you were less hungry after the first, and were willing to pay as much as $3 for it. The marginal benefit for the second slice of pizza was: