"38% of adults in the united states regularly visit a doctor". this conclusion was reached by a college student after she had questioned 520 randomly selected members of her college. what is the problem with her survey?

Step-by-step explanation:

Given that a college student concluded "38% of adults in the United States regularly visit a doctor"

For this,  student  questioned 520 randomly selected members of her college

The problem here is

when she is concluding about the adults as a whole in the world, taking into account the total population of adults, 520 is not a proportional size representing the entire population

Also she selected only members of her college.  This may give a biased opinion.  

To get correct idea, she must survey a large sample size from all over the countries and come to conclusion

the answer is 31.27mph