4 Many parents are interested in a children's camp that recently opened, but only a small portion of the interested parents have enrolled their children in the camp. Currently, camp is held Monday-Friday from 10 am until noon. The owner wants to know if more of the interested parents would enroll their children if the camp was held in the evening. To investigate, she selects a random sample of parents who already bring their children to the camp and asks them if they would enroll their children if they switched to evening hours. The results show that 8% of the parents in the sample would enroll their children if they switched to evening hours.
(a) What type of sample did the owner obtain?
(b) Explain why this sampling method is biased. Is the percent of parents in the sample that would enroll their children if they switched to evening hours likely greater than or less than the percent of all interested parents who would enroll their children in the camp if it were held in the evening?

O (a) Voluntary Response sample. (b) This sampling method is biased because they only surveyed parents who currently have their children enrolled in the camp.
O (a) Convenience sample. (b) This sampling method is biased because they only surveyed parents who currently have their children enrolled in the camp.
O (a) Response bias sample. (b) This sampling method is biased because they only surveyed parents who currently have their children enrolled in the camp.
O (a) Nonresponse sample. (b) This sampling method is biased because they only surveyed parents who currently have their children enrolled in the camp.