Examlex
Categories of contingent workers include independent contractors, but not on-call workers.
Internal Validity
The extent to which a study or experiment can establish a cause-and-effect relationship within its scope, free from external influences.
Observational Studies
Research methods where subjects are observed in their natural environment without any manipulation by the researcher, used to collect data on behaviors, outcomes, or phenomena.
Laboratory Experiments
Controlled tests conducted in a structured and isolated environment to investigate hypotheses by manipulating variables.
External Variables
Factors outside the individual that can influence their behavior or the outcome of a situation, including environmental, social, or economic conditions.
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