Random digit dialing. The list of individuals from which a sample is actuallyselected is
Chapter 0, Problem 8.45(choose chapter or problem)
Random digit dialing. The list of individuals from which a sample is actuallyselected is called the sampling frame. Ideally, the frame should list every individualin the population, but in practice this is often difficult. A frame that leaves outpart of the population is a common source of undercoverage.(a) Suppose that a sample of households in a community is selected at randomfrom the telephone directory. What households are omitted from this frame?What types of people do you think are likely to live in these households? Thesepeople will probably be underrepresented in the sample.(b) It is usual in telephone surveys to use random digit dialing equipment thatselects the last four digits of a telephone number at random after being given theexchange (the first three digits). Which of the households you mentioned in youranswer to (a) will be included in the sampling frame by random digit dialing?
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