A random sample of 500 teenagers were grouped in the following way: ages 1314, 1517, and 1819.

Question:

A random sample of 500 teenagers were grouped in the following way: ages 13–14, 15–17, and 18–19. Each teenager was asked to record the number of Facebook friends each had. Is there sufficient evidence to infer that there are differences in the number of Facebook friends between the three teenage groups?