Are the two groups of users who are offered (i) a $150 phone credit, or (ii) a $10 pre-paid\ Visa card probabilistically equivalent? Why or Why not? (1 point)\ Question 2. Are the two groups of users who sign-up for (i) a $150 phone credit, or (ii) a $10 pre-paid\ Visa card probabilistically equivalent? Why or Why not? (1 point)\ Question 3. Are the two groups of users who sign-up for (i) a $150 phone credit, or (ii) a $10 pre-paid\ Visa card equally pre-disposed to liking Celtel?   Unsure and explain your choice? (1 point)\ Question 4. Can you answer Joy Mukherjees question Does this mean that the $150 phone credit is\ causally responsible for the 18 percentage point increase in new customer acquisition for customers\ who expressed an interest in new phone on Facebook? Why or Why not?