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Part 1

What type of sampling was used?

A.

Systematic sampling was used, since phone numbers were selected from a list using a fixed interval between phone numbers.

B.

Convenience sampling was used, since the

800

phone numbers that were easiest to reach were selected.

C.

Cluster sampling was used, since the phone numbers were divided into groups, several groups were selected, and each number in those groups was called.

D.

Simple random sampling was used, since each number had an equal chance of being dialed, so all samples of

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phone numbers had an equal chance of being selected.

Your answer is correct.

Part 2

What potential sources of bias were present, if any? Select all that apply.

A.

Individuals may have not been available when the researchers were calling. Those individuals that were available may have not been representative of the population.

B.

Telephone sampling only includes people who had telephones. People who owned telephones may have been older or wealthier on average, and may not have been representative of the entire population.

C.

Individuals may have refused to participate in the sample. This may have made the sample less representative of the population.

D.

If there was a regular pattern to the numbers dialed, it is possible for the sample to not have been representative of the population.

E.

There were no potential sources of bias.