18. The director of operations for an oil company wants to measure employee satisfaction at his chain of convenience stores. He randomly selects 2/9 districts of stores for his HR director to survey all the employees regarding how satisfied they are with their job. What type of sampling design was used to gather the data? a. stratified
18. The director of operations for an oil company wants to measure employee satisfaction at his
chain of convenience stores. He randomly selects 2/9 districts of stores for his HR director to
survey all the employees regarding how satisfied they are with their job. What type of sampling
design was used to gather the data?
a. stratified
b. cluster
c. systematic
d. simple random
Use the following information to answer questions 19 and 20: An experimenter rolls two dice, each with
twelve sides numbered 1 through 12. Let A = both dice land on even numbers. Let B = both dice land on
numbers greater than 8.
19. Events A and B are:
a. independent
b. mutually exclusive
c. neither a nor b
d. both a and
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