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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.
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
95%
(hard)
Question Stats:
43% (02:30) correct
57%
(02:53)
wrong
based on 248
sessions
History
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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.
02 Jun 2026, 03:25
Kudos
Bookmarks
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.
Blood donors are generally allowed to donate whole blood only once every two months.
OK, but how do they feel about donating?
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.
OK, but what about after they have another donation?
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.
This is worth keeping for now, but it's probably incorrect because buying groceries is not making a second donation.
People report that making charitable donations causes them to feel better about themselves.
OK, but do they feel differently about making donations soon after making a donation?
People tend to give less to charity during weeks in which they help neighbors by providing a needed good or service.
This strengthens the argument by providing another example of donations being less likely after people have done something charitable.
A different study found that few blood donors consider donating blood to be comparable to “charitable giving.”
This weakens the argument by showing that people don't consider donating blood to be a way of "satisfying charitable obligations.
Correct answer: A different study found that few blood donors consider donating blood to be comparable to “charitable giving.", People tend to give less to charity during weeks in which they help neighbors by providing a needed good or service.
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.
Blood donors are generally allowed to donate whole blood only once every two months.
OK, but how do they feel about donating?
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.
OK, but what about after they have another donation?
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.
This is worth keeping for now, but it's probably incorrect because buying groceries is not making a second donation.
People report that making charitable donations causes them to feel better about themselves.
OK, but do they feel differently about making donations soon after making a donation?
People tend to give less to charity during weeks in which they help neighbors by providing a needed good or service.
This strengthens the argument by providing another example of donations being less likely after people have done something charitable.
A different study found that few blood donors consider donating blood to be comparable to “charitable giving.”
This weakens the argument by showing that people don't consider donating blood to be a way of "satisfying charitable obligations.
Correct answer: A different study found that few blood donors consider donating blood to be comparable to “charitable giving.", People tend to give less to charity during weeks in which they help neighbors by providing a needed good or service.
