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Which of these is an example of a random sample?

A.Every twentieth caller to an independent radio station receives tickets to a concert.

B.Customers buying a new cell phone are surveyed about cell phone plans.

C.A phone plan company surveys people on the beach to see how well they are receiving service, and uses this information in future advertising.

D.A phone survey is conducted using twenty names randomly taken from the phone book.

Sagot :

"D.A phone survey is conducted using twenty names randomly taken from the phone book" is the only example of a random sample. All the others take into account the environment.

Answer:

D.) A phone survey is conducted using twenty names randomly taken from the phone book.

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