Question

What type of sampling was used in 1965 when researchers used random digit dialing to call 1400 people and ask what obstacles kept them from exercising?

1) Simple random sampling
2) Stratified sampling
3) Cluster sampling
4) Systematic sampling

Answer 1

Random digit dialing was used, which is a type of systematic sampling where every nth element is selected from a population list.

Step-by-step explanation:

The type of sampling used in 1965 when researchers used random digit dialing to call 1400 people and ask what obstacles kept them from exercising was random digit dialing itself, which falls under the category of systematic sampling. Systematic sampling selects every nth element from a population list, in this case using a computerized phone number generator.