Teen Communication The following data represent the number of different communication activities (e.g., cell phone, text messaging, e-mail, Internet, and so on) used by a random sample of teenagers over the past 24 hours.
(a) Are the events "male" and "0 activities" independent? Justify your answer.
(b) Are the events "female" and "5+ activities" independent? Justify your answer.
(c) Are the events "1-2 activities" and "3-4 activities" mutually exclusive? Justify your answer.
(d) Are the events "male" and "1-2 activities" mutually exclusive? Justify your answer.