The opening vignette in Chapter 10 from an executive with Survey Sampling International illustrates what basic idea about sample size when conducting a telephone survey?
a. A desire to save money by not drawing too large a sample for telephone surveys.
b. Telephone surveys can be accomplished with very small samples.
c. If you have determined your sample size needs to be a certain size, say 800, you will need to have a sample size several times larger, say about 9,000, of numbers to call in a telephone interview.
d. A correct belief that sample size determines a sample's representativeness in telephone surveys.
e. It is easier to sample for telephone surveys because SSI now has access to non-listed numbers.
Answer: c. If you have determined your sample size needs to be a certain size, say 800, you will need to have a sample size several times larger, say about 9,000, of numbers to call in a telephone interview.