People in a small remote village of Peru have developed a viral infection.
 Scientists hypothesize that the virus is being transmitted by mosquitoes. The
 scientists look for the virus in a sample of 100 mosquitos from a nearby wooded
 area to the east of the village. When the scientist finds no mosquitoes, they
 conclude that the residents are not getting the virus from area mosquitoes. What
 is the source of the scientists error? *