SOLUTION: Over the past 30 years in the US there has been a strong negative correlation between the number of infant deaths at birth and the number of people over the age 65.
Is the fact 
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Question 567771:  Over the past 30 years in the US there has been a strong negative correlation between the number of infant deaths at birth and the number of people over the age 65.
Is the fact that people are living longer causing a decrease in infant deaths at birth?
What lurking variables might be causing the increase in one or both of the variables? Explain. 
Answer by stanbon(75887)   (Show Source): You can put this solution on YOUR website!
 Improved medical facilities and care are lurking variables.
They reult in better care for the elderly and better care for 
post natal infants.
Cheers,
Stan H.
 
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