Here are some more news headlines from real observational studies. Just as you did in problem 4-84, determine at least one plausible lurking variable that could explain the cause and effect. Remember, do not argue about the link expressed in the headline. Accept the association or link as true. Your task is to find the other variable(s) that could be the actual cause(s).
“Teens with own cars more likely to crash”
With a car readily available these teens might simply be driving more and the extra time on the road is causing them to be in more crashes.
“Bottled water linked to healthier babies”
If the family can afford bottled water what other advantageous amenities can they afford that might affect a child's health?