Sprint would like to take customers from Pacific Bell, one of its competitors in a certain geographical area. Sprint would like to survey Pacific Bell's customers in order to find out which elements of its service are least satisfactory. Which of the following procedures would be most appropriate for obtaining a statistically unbiased sample?
?
A. Survey a random selection of people chosen from a list of Pacific Bell's customers.
B. Survey a random selection of people chosen from a list of Sprint's customers.
C. Place newspaper advertisements seeking survey participants and survey 100 people randomly chosen from those who respond.
D. Call local phone numbers and ask the person who answers if they are satisfied with their phone service.
Answer: A
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