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Researchers studied 200 male in the prison and found that 8 of them had XYY syndrome and then recruited 200 males outside of the prison and found that none of them had an extra y chromosome. They thus concluded that male with XYY syndrome are more dangerous.

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The London suburbs have been experiencing heavy fog for the past week. According to the latest report from the Ministry of Health, the number of deaths due to the heavy fog has sharply increased to 2,800 in just one week.

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During the war between US and Spain, the death rate of the US Navy was 9‰, and the death rate of New York City residents during the same period was 16‰, so being sailors at US Navy is very safe.

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According to NHS data, the number of incident cases of major depressive disorder worldwide increased from 162 million in 1990 to 241 million in 2017, representing an increase of 49.29%. Humans are getting worse in mental health.

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The number of population is increased as well

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It ignored the total population increase.

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Only focus on the number, ignoring the percentage

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Measurement errors. The population is also rising. Absolute Number is not a correct measurement.

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There are too many uncertainties in this comparison. Some variables like age, gender and so on are not considered.

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Causality problem. They may have correlation. However, These two things do not necessarily constitute cause and effect relationships.

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Causality problem. There may be Correlation between fog and health. However, death rate is not necessarily effect of the fog(cause).

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Only emphasis on percentage, ignoring the number of savy is far less than that of the residents in New York.

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There is no correlation between fog and death rate

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The population also increased and the accuracy of testing this disease getting better

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Sampling bias

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the health condition of navy and resident are totally different, can’t compare in this way