The basketball players at Rafael’s middle school are selling T-shirts, and he wants to determine the average number of shirts that have been sold. First he surveyed five members of the 7th-grade boys basketball team. Then he surveyed every third basketball player on the boys and girls 6th- through 8th-grade basketball teams. Which sampling technique should produce a more representative sample?
The first sampling method (7th graders) is the most representative.
The second sampling method (6th–8th graders) is the most representative.
Both samples should be exactly the same.
Neither sample will be representative.