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A research assistant is interviewing elderly adults at community center, but only adults who have access to transportation to the center are likely to participate. This illustrates what type of threat to external validity?
Indefinite Future Time
A period that has no specified end date.
Unconditional Promise
An unconditional promise is a firm commitment or pledge made by one party to another, without any stipulations or conditions attached.
Check-clearing Process
The method through which banks collect and settle the amount of a check, transferring funds from one account to another.
Movability
The characteristic of an asset that allows it to be transferred or moved from one location to another.
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