Which of the following are anecdotal and which are based on a sample?
(a) Ellie told her friends that she is saving $31 a month because she changed to a prepaid cell phone.
(b) One morning, among a large number of coffee shop patrons, the orders of 47 coffee drinks were recorded and 11 of these were espresso-based drinks.
(c) Out of 200 college students at a large university, over half thought about food more than 17 times a day.