What is the best way to eliminate threats to external validity?

Dr. Kerplopkin wants to better understand the amygdala’s role in addictive behavior in mice. He injects an experimental drug at different concentrations directly into the amygdala to determine its effects on the mice’s ability to withstand addictive behavior to morphine. Name the dependent variable in Dr. Kerplopkin’s experiment.

A researcher wants to learn more about the onset and maintenance of a newly discovered neurological condition. Which methodological approach should he use

Selecting a sample from a population in a clinical study where you would want to include as many different backgrounds as possible would involve

During REM, the activation of the [answer1] for emotion and the [answer2] for memory help explain the sometimes bizarre and intense dreams we experience. 

price floor Based on the supply and demand graph shown above, the introduction of this Price Floor would cause a [BLANK-1] of [BLANK-2] million of pints of milk per year.

Once the price floor introduced, how much quantity of milk would be demanded? Place pin on correct quantity on the graph below.

Once the price floor introduced, how much quantity of milk would be produced? Place pin on correct quantity on the graph below.

In the ancient country of Roma, only two goods, spaghetti and meatballs, are produced. There are two tribes in Roma, the Tivoli and the Frivoli. By themselves, the Tivoli each month can produce either 30 pounds of spaghetti and no meatballs, or 50 pounds of meatballs and no spaghetti, or any combination in between. The Frivoli, by themselves, each month can produce 40 pounds of spaghetti and no meatballs, or 30 pounds of meatballs and no spaghetti, or any combination in between. Opportunity Cost Use the table below to type in the opportunity cost for each good for both tribes (round numbers to 2 decimals places): ​ Opp. Cost of 1 pound of spaghetti​ Opp. Cost of 1 pound meatballs​ ​Frivoli ​[BLANK-1] [BLANK-2]​ ​Tivoli [BLANK-3]​ [BLANK-4]​ Absolute Advantage a. Which tribe has the absolute advantage in spaghetti production? [BLANK-5] b. Which tribe has the absolute advantage in meatball production? [BLANK-6] Comparative Advantage a. Which tribe has the comparative advantage in spaghetti production? [BLANK-7] b. Which tribe has the comparative advantage in meatball production? [BLANK-8] c. Based on your answers for comparative advantage, it would make sense that Frivoli exports [BLANK-9] and Tivoli exports [BLANK-10]

Untitled.jpg Shifting Supply and Demand For the following examples, always start at E1. a. Coffee producers around the world have had a bad harvest due to climate change. What would be the most likely new equilibrium [BLANK-1]. Based on the previous answer, price would be [BLANK-2] and quantity would be [BLANK-3]. b. Assume that new medical benefits to drinking coffee have been discovered (and announced to the public), but as example (a) stated there was a bad harvest season for coffee producers around the world. Given these simultaneous events, the new equilibrium would most likely be [BLANK-4]. Based on this new equilibrium, the price would be [BLANK-5], and quantity [BLANK-6].