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15.30 Do emergency personnel make injuries worse? Someone says, “There is a strong positive correlation between...

15.30 Do emergency personnel make injuries worse? Someone says, “There is a strong positive correlation between the number of emergency personnel at the scene of an accident and the extent of injuries of those in the accident. So sending lots of emergency personnel just causes more severe injuries.” Explain why this reasoning is wrong.

math   Statistics-And-Probability   
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it is given that there is a positive relationship between the number of emergency personnel at the scene of an accident and the extent of injuries of those in the accident. This does not means that there is a causation between the the number of emergency personnel at the scene of an accident and the extent of injuries of those in the accident., i.e. this is not always possible that change in one variable causes the change in the other variable.

Strong positive relationship between the number of emergency personnel at the scene of an accident and the extent of injuries of those in the accident means that whenever there is severe injuries, then the number of emergency personnel needed increases based on the number of injuries.

So, we cant say that sending lots of emergency personnel just causes more severe injuries because strong positive relationship just shows us direction of relationship, but never tells us which variable is dependent and which is independent.

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