Question 1
In which study would it be impossible to implement a double-blind procedure?
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a study on the effects of a new pain medication◦
a study that tests whether yoga influences mood◦
an experiment that requires informed consent◦
an experiment that has a completely representative sampleQuestion 2
Jack believes that patrons in his bar will be more likely to leave a tip if the tip jar already has some money in it. To test this belief, he has the tip jar empty about half the time when a customer approaches the bar; the rest of the time he ensures there is at least $5.00 in the jar when a customer approaches. In Jack's experiment, which is the control group?
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the patrons who see an empty tip jar◦
all the patrons who leave the bar without tipping◦
the patrons who see a tip jar that contains at least $5.00◦
all the patrons who leave a tip when they leave the bar