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The first born child is likely to academically outperforms their siblings.

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The amount of sunlight exposure is negatively correlated to the number of self reported depression cases.

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Increased flexibility in work schedules increases employee satisfaction

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Well-rested students perform better academically.

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People who listen to classical music have a better memory.

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People who consume more beef are likely to be more hairy.

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there is a positive relationship between the relationship duration and facial similarity between the partners.

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The more extroverted the person is, the happier the person (Correlational study, non experimental)

Edit: Extroversion is positively correlated to happiness
Extroversion cannot control

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There is a negative correlation between drinking and productivity.

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People are more likely to change their hairstyle after a relationship breakup. (prove a relationship but not a causal-effect experiment)

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Students are more likely to reduce their attention span after prolonged online learning.

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Students from single sex schools are more likely change their physical appearance after switching to a co-ed school. (longitudinal study)

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IS graduates land higher paying jobs.
Edit: IS students (tend to)(are more likely to land higher paying jobs.

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People with bigger ears have better hearing.

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Individuals who consume more caffeine are more likely to be faster runners.

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Drinking apple juice makes a person smarter

Edit: More likely to make a person smarter

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People who live closer to their workplace are more likely to be late for work.

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There is a positive relationship between the amount of exercise per week and a person's sleep quality.