( the points for each). l. and a survey on their rankings front st rongly disagree to strongly the survey t hey sample with 5300 A. Voluntary response sample C Sirnple randorn sample B. Convenience sarnple D. Stratified random sample 2. ()ne chain store wanted to know how promotion effects their sales. 'l'hey randonlly selected five stores, collected five stores' sales mnount before and after the prornotion, an(l looked into the sales difference. This is A. ()b.servational study B. Experiment Study 3. Let A, B be two events, and P (A n B) = 0, then events A, B are NOT independerlt (dependent). A. enue B. False 4. In a grocery store, it is known that 60% customers pay witli credit card, 20% customers pay with debit card, and 10% custonxers pay with cash. 80 randomly selected customers, let X be the number of customers who pa: with cash. Then the distribution of X is 1). 0.2) C. B(80, 0.1) B. 13(80, 0.9) A. 13(100, 0.6) 2