Jack believes that patrons in his bar will be more likely to ...

[abarnes]

Question 1

In which study would it be impossible to implement a double-blind procedure?

◦ 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 sample

Question 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?

◦ 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

[mmpiza]

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[jackie lawrence]

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