An internet provider asks a consultant to contact 130 residential clients and me

Question

An internet provider asks a consultant to contact 130 residential clients and measure their level of satisfaction with their internet service. The consultant obtains an alphabetized list of client names and starting with the letter A, uses a random number generator to pick five names from this group. The consultant uses the same selection method for each of the other 25 letters and combines the 5 × 26 = 130 names into a group of clients to be surveyed.     

Which of the following statements is true?

A) The selection method makes use of chance.

B) The selection method results in a single-stage cluster sample.

C) Each client has an equal probability of being included in the survey.

D) The selection method introduces bias through sampling error.

E) For a sample this size, it is best to let the researcher hand pick a representative set of clients.

Explanation / Answer

Answer: A. The selection method makes use of chance.

Reason: The consultant runs a random number generator for each letter, hence, involving the method of selection by chance.

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