A hairdresser wants to know if her clients are happy with her. She decides to survey a sample of her clients. What method would be best for choosing a random sample that is a fair representation of her patients
a. Give a survey to the next one hundred clients who come to the office.
b. Call the first one hundred clients in alphabetical order.
c. Ask the receptionist to refer one hundred clients to call.
d. Assign numbers to each client and then use a random number generator to choose one hundred clients to survey
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