ldentify the sampling techniques used, and disouss potential sources of bias if
ID: 3063166 • Letter: L
Question
ldentify the sampling techniques used, and disouss potential sources of bias if any). xplain. In 1965, researchers used random digit dialing to call 1100 people and ask whet obstacles kopt them from buying insurance. What type of sampling was used? O A. Simple random sampling was used, sinoe each number had an equal chance of being dialod, so all samples af 1100 phone numbers had an equal chance af being selected. B. Cluster sampling was used, since the phone numbers were divided into groups, s several groups wene selected, and each number in those groups was calied. C. Systematic sampling was used, since phone numbers were selected from a list using a fixed interval between phone numbers. D. Convenience sampling was used, since, the 1100 phone numbers that were easiest loro ach were selected What potential sources of blas were present, if any? Select all that apply A The sample only consisted of members of the population that were easy to get. These members may have not been representative of the population B. Telephone sampling only includes people who had telephones. People who owned telephones may have been oider or wealthier on average, and may nat have been nepresentative of the enfire populatiorn C. Individuals may have refused to participate in the sample. This mey have made the sample less representative of the population D. Individuals may have not been available when the researchers were calling. Those individuals that were available may have not been representative of the population. E. There were no potential sources of bias.Explanation / Answer
The 1100 people are selected in totally random fashion without any grouping or criteria.
The type of sampling:
A. Simple random sampling was used, since each number has an equal chance of being dialed, so all samples of 1100 phone numbers had an equal chance of being selected.
The potential sources of bias arise because the customers need to own a telephone, need to be willing to participate and need to be available when the researchers were calling.
Therefore the correct answers are B,C and D.
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