Clara calls potential research participants and asks if they would be willing to give blood. Once they have agreed to

Clara calls potential research participants and asks if they would be willing to give blood. Once they have agreed to donate blood, she informs them that their donation is scheduled at 7:00 in the morning on a Saturday. Though most participants are not happy to hear this information, almost all of them do show up for the blood donation appointment. Clara has taken advantage of


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