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06 May 2026, 11:55
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Difficulty:
65%
(hard)
Question Stats:
46% (01:25) correct
54%
(01:45)
wrong
based on 37
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In the country of Boldavia at present, only 1 percent of 80-year-olds are left-handed, whereas 10 percent of 50-year-olds and 15 percent of 20-year-olds are left-handed. Yet over the past 80 years, the proportion of Boldavians who are born left-handed has not increased, nor have Boldavian attitudes toward left-handedness undergone any important changes.
Which one of the following, if true, most helps to explain the variation in incidence of left-handedness among Boldavians?
(A) In Boldavia, where men have a shorter average life expectancy than do women, left-handedness is less common among women than among men.
(B) In Boldavia, left-handed people are no more likely than right-handed people to be involved in accidents.
(C) Ambidexterity is highly valued in Boldavia.
(D) The birthrate in Boldavia has decreased slowly but steadily over the course of the past 80 years.
(E) Left-handed people have never accounted for more than 18 percent of the population of Boldavia.
Which one of the following, if true, most helps to explain the variation in incidence of left-handedness among Boldavians?
(A) In Boldavia, where men have a shorter average life expectancy than do women, left-handedness is less common among women than among men.
(B) In Boldavia, left-handed people are no more likely than right-handed people to be involved in accidents.
(C) Ambidexterity is highly valued in Boldavia.
(D) The birthrate in Boldavia has decreased slowly but steadily over the course of the past 80 years.
(E) Left-handed people have never accounted for more than 18 percent of the population of Boldavia.
06 May 2026, 13:15
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In the country of Boldavia at present, only 1 percent of 80-year-olds are left-handed, whereas 10 percent of 50-year-olds and 15 percent of 20-year-olds are left-handed. Yet over the past 80 years, the proportion of Boldavians who are born left-handed has not increased, nor have Boldavian attitudes toward left-handedness undergone any important changes.
Which one of the following, if true, most helps to explain the variation in incidence of left-handedness among Boldavians?
The puzzle is that younger Boldavians have a much higher rate of left-handedness, even though the birth rate of left-handedness has not increased and attitudes have not changed. So the explanation must come from survival or population composition, not from more people being born left-handed or more people admitting it.
(A) In Boldavia, where men have a shorter average life expectancy than do women, left-handedness is less common among women than among men.
Correct. If men are more likely to be left-handed and men die earlier on average, then older age groups will contain proportionally fewer men and therefore fewer left-handed people. This explains why left-handedness is much lower among 80-year-olds.
(B) In Boldavia, left-handed people are no more likely than right-handed people to be involved in accidents.
Wrong. This removes one possible explanation but does not explain the age-based difference.
(C) Ambidexterity is highly valued in Boldavia.
Wrong. This does not explain why different age groups have different rates of left-handedness, especially since attitudes have not importantly changed.
(D) The birthrate in Boldavia has decreased slowly but steadily over the course of the past 80 years.
Wrong. Overall birthrate does not explain why the percentage of left-handed people differs by age group.
(E) Left-handed people have never accounted for more than 18 percent of the population of Boldavia.
Wrong. This gives only an upper limit. It does not explain the pattern among 20-year-olds, 50-year-olds, and 80-year-olds.
Answer: (A)
Which one of the following, if true, most helps to explain the variation in incidence of left-handedness among Boldavians?
The puzzle is that younger Boldavians have a much higher rate of left-handedness, even though the birth rate of left-handedness has not increased and attitudes have not changed. So the explanation must come from survival or population composition, not from more people being born left-handed or more people admitting it.
(A) In Boldavia, where men have a shorter average life expectancy than do women, left-handedness is less common among women than among men.
Correct. If men are more likely to be left-handed and men die earlier on average, then older age groups will contain proportionally fewer men and therefore fewer left-handed people. This explains why left-handedness is much lower among 80-year-olds.
(B) In Boldavia, left-handed people are no more likely than right-handed people to be involved in accidents.
Wrong. This removes one possible explanation but does not explain the age-based difference.
(C) Ambidexterity is highly valued in Boldavia.
Wrong. This does not explain why different age groups have different rates of left-handedness, especially since attitudes have not importantly changed.
(D) The birthrate in Boldavia has decreased slowly but steadily over the course of the past 80 years.
Wrong. Overall birthrate does not explain why the percentage of left-handed people differs by age group.
(E) Left-handed people have never accounted for more than 18 percent of the population of Boldavia.
Wrong. This gives only an upper limit. It does not explain the pattern among 20-year-olds, 50-year-olds, and 80-year-olds.
Answer: (A)
06 May 2026, 23:30
Kudos
Bookmarks
In the country of Boldavia at present, only 1 percent of 80-year-olds are left-handed, whereas 10 percent of 50-year-olds and 15 percent of 20-year-olds are left-handed. Yet over the past 80 years, the proportion of Boldavians who are born left-handed has not increased, nor have Boldavian attitudes toward left-handedness undergone any important changes.
Which one of the following, if true, most helps to explain the variation in incidence of left-handedness among Boldavians?
The puzzle is that younger groups have much higher rates of left-handedness, even though left-handed birth rates and social attitudes have not changed. So the explanation must involve some other factor, such as who survives into older age. The key idea is that the older population may have a different gender composition.
(A) In Boldavia, where men have a shorter average life expectancy than do women, left-handedness is less common among women than among men.
Correct. If men are more likely to be left-handed, but men are also less likely to survive to age 80, then the 80-year-old group will contain fewer men and more women. Since women are less often left-handed, this explains why left-handedness is much lower among 80-year-olds.
(B) In Boldavia, left-handed people are no more likely than right-handed people to be involved in accidents.
Wrong. This rules out one possible explanation, but it does not explain the age difference.
(C) Ambidexterity is highly valued in Boldavia.
Wrong. Since attitudes have not changed importantly, this does not explain why younger and older groups differ.
(D) The birthrate in Boldavia has decreased slowly but steadily over the course of the past 80 years.
Wrong. Overall birthrate does not explain why the percentage of left-handed people differs by age group.
(E) Left-handed people have never accounted for more than 18 percent of the population of Boldavia.
Wrong. This gives a general limit, but it does not explain the specific pattern across ages.
Answer: (A)
Which one of the following, if true, most helps to explain the variation in incidence of left-handedness among Boldavians?
The puzzle is that younger groups have much higher rates of left-handedness, even though left-handed birth rates and social attitudes have not changed. So the explanation must involve some other factor, such as who survives into older age. The key idea is that the older population may have a different gender composition.
(A) In Boldavia, where men have a shorter average life expectancy than do women, left-handedness is less common among women than among men.
Correct. If men are more likely to be left-handed, but men are also less likely to survive to age 80, then the 80-year-old group will contain fewer men and more women. Since women are less often left-handed, this explains why left-handedness is much lower among 80-year-olds.
(B) In Boldavia, left-handed people are no more likely than right-handed people to be involved in accidents.
Wrong. This rules out one possible explanation, but it does not explain the age difference.
(C) Ambidexterity is highly valued in Boldavia.
Wrong. Since attitudes have not changed importantly, this does not explain why younger and older groups differ.
(D) The birthrate in Boldavia has decreased slowly but steadily over the course of the past 80 years.
Wrong. Overall birthrate does not explain why the percentage of left-handed people differs by age group.
(E) Left-handed people have never accounted for more than 18 percent of the population of Boldavia.
Wrong. This gives a general limit, but it does not explain the specific pattern across ages.
Answer: (A)
