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31 May 2026, 08:51
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Most weakens: A different study found that few blood donors consider donating blood to be comparable to “charitable giving.”
Most strengthens: People tend to give less to charity during weeks in which they help neighbors by providing a needed good or service.
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In a study of human behavior, researchers solicited charitable donations from two different groups of people, those having just donated blood and those having just visited a doctor. Contributions from blood donors were significantly less than contributions from people who had visited a doctor. The researchers concluded that people believe their obligation to behave generously is finite. Therefore those who had donated blood, the researchers explained, believed they had temporarily somewhat satisfied their charitable obligations.
Which of the following would, if true, most weaken the researchers’ conclusion, and which would, if true, most strengthen it? Make only two selections, one in each column.
Which of the following would, if true, most weaken the researchers’ conclusion, and which would, if true, most strengthen it? Make only two selections, one in each column.
| Most weakens | Most strengthens | |
| Blood donors are generally allowed to donate whole blood only once every two months. | ||
| People report that they are more likely to make charitable donations when the request is made in person than when it is made over the phone. | ||
| People who placed money in a store’s charity collection container before shopping bought fewer groceries, on average, than those who did so after shopping. | ||
| People report that making charitable donations causes them to feel better about themselves. | ||
| People tend to give less to charity during weeks in which they help neighbors by providing a needed good or service. | ||
| A different study found that few blood donors consider donating blood to be comparable to “charitable giving.” |
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Official Answer
Most weakens: A different study found that few blood donors consider donating blood to be comparable to “charitable giving.”
Most strengthens: People tend to give less to charity during weeks in which they help neighbors by providing a needed good or service.
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31 May 2026, 08:56
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Answer Explanation (Official) :
Evaluate
The researchers explained the study results by positing that the blood donors believed they had temporarily satisfied their charitable obligations by donating blood and thus didn’t feel obliged to be as generous with their donations to charity.
But if a different study found that few blood donors consider donating blood to be comparable to charitable giving, that finding would weaken the researchers’ hypothesis by suggesting that the blood donors wouldn’t be likely to make the posited connection between donating blood and donating to charity.
On the other hand, a finding that people tend to give less to charity during weeks in which they help their neighbors would strengthen the researchers’ hypothesis by providing further evidence that people feel both that their obligations to behave generously are finite and that behaving generously in one way temporarily excuses them from behaving generously in other ways.
Most weakens:
The correct answer is A different study found that few blood donors consider donating blood to be comparable to “charitable giving.”
Most strengthens:
The correct answer is People tend to give less to charity during weeks in which they help neighbors by providing a needed good or service.
Evaluate
The researchers explained the study results by positing that the blood donors believed they had temporarily satisfied their charitable obligations by donating blood and thus didn’t feel obliged to be as generous with their donations to charity.
But if a different study found that few blood donors consider donating blood to be comparable to charitable giving, that finding would weaken the researchers’ hypothesis by suggesting that the blood donors wouldn’t be likely to make the posited connection between donating blood and donating to charity.
On the other hand, a finding that people tend to give less to charity during weeks in which they help their neighbors would strengthen the researchers’ hypothesis by providing further evidence that people feel both that their obligations to behave generously are finite and that behaving generously in one way temporarily excuses them from behaving generously in other ways.
Most weakens:
The correct answer is A different study found that few blood donors consider donating blood to be comparable to “charitable giving.”
Most strengthens:
The correct answer is People tend to give less to charity during weeks in which they help neighbors by providing a needed good or service.
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