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Part 1

Identify the sampling techniques used, and discuss potential sources of bias (if any). Explain.

In 1965, researchers used random digit dialing to call

800

people and ask what obstacles kept them from

exercising.

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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

800

phone numbers had an equal chance of being selected.