Which one of the following is the best experimental design?
A. All the people in the group wear the patches.
B. All wear patches except one person who tries to give up smoking without them.
C. People choose whether or not they will use patches to help give up smoking.
D. Half are randomly chosen to use patches and the other half do not use them.
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PISA contains a mixture of questions, and most students will have to answer some science, reading and mathematics questions. The combination of questions will depend on which test booklet you are randomly assigned – PISA has 13 different test booklets. Not only are the topics varied, so are the types of questions
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