Given is - A study of 860 U.S. ATMs found that the average surcharge for withdrawals from a competing bank was $1.15. The sample is ATMs from a competing bank.
A competing bank cannot be thousands. Rather a competing bank can have hundreds of ATM's throughout US. So, the given number of ATM's is sample here. The statement is true.
If it would have been that the sample ATM's is from all U.S, then the statement would have been false.
