4.3 Ikuphi okusivezela ukuthi u-Ankeli umangele futhi ikuphi okusivezela ukuthi umshana uyacasuka? (2)

As part of a research study, I am sometimes given a substance that makes my heart rate increase, and at other times I am given a substance that has no effect on me (placebo). During these administrations, I am also asked to press buttons for which I can earn money. I learn that on the days when I experience my heart racing, I should press button 1 to receive reward, and on days when I don’t experience that effect I should press button 2 to receive reward. Thus, the presence of the drug is essentially telling me how to behave to receive reward, and is serving as a:

I want to know if college students perform better on a math test when they take Adderall. Forty students participate in this research on two occasions: on one visit they receive Adderall, and on the other they receive a placebo. This way I can directly compare each subject’s performance on Adderall to their performance on placebo, while keeping individual levels of intelligence constant. Neither the subjects nor the experimenter knows which type of pill the subject gets on each visit. What type of experiment is this?

What is the main idea of Hubbert’s Peak?

“[As a resource, Oil Sands are] so distinct that only relatively recently has __________________ […] included it when calculating Canada’s reserves.”

5.2.2 Umusho ‘Abafana kuphela abangaba oNjiniyela’ uhambisana naluphi uhlobo lolimi. (2)

Which of the following is an indicator of a drug’s abuse potential?

“While ______________ as a technology dates back to the 1920s, it is relatively new as a large-scale practice in the energy industry. […]”

1.2.3 Ngokucabanga kwakho, yini lena eyenza lezi ngane zihleke kangaka? (2)

Which of the following drugs is the least safe, according to its therapeutic index?