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Subset of population:

The following are types of probability sampling except:

Which of the following has the most impact negatively on the representativeness of a sample, regardless of the selection technique used?

Watching/observing participants:

Which of the following terms relates to the extent to which a test measures what it is intended to measure:

Inclusion and exclusion criteria control for extraneous variables related to subject selection.

In a research study, patients are randomly assigned a unique identification number. These numbers represent a(n):

Intervention fidelity = consistency

Which one of the following statements is true about non-probability sampling techniques and probability sampling techniques?

Nominal scale includes gender, race, and marital status.