1. 'If you want to make a drink, and let people taste quinine, how much quinine do you have to put in to let people actually taste it?'
2. 'What is the minimum concentration level of quinine for people to taste it?'
3. ‘How is it possible that each student did or did not taste quinine in a certain cup, even though there’s just one correct answer?’
4. 'Do people in Africa taste better than in Europe?
5. How high should the treshold value of quinine (mg/l H2O) be to be noticed by an average Dutch teenager?
6. What is the relationship between the concentration of quinine and the amount of students tasting it?
7. What is the treshold value for Dutch teenagers?