Final answer:
The research study used quota sampling to ensure an equal number of male and female participants, alongside convenience sampling.
Step-by-step explanation:
The sampling method used in the study of the lived experience of losing a limb, where subjects were recruited for the study until an equal number of males and females were obtained, is quota sampling. This method involves selecting people non-randomly until a predefined proportion is reached in each category of interest, thus ensuring an equal representation of males and females. Convenience sampling was also used since the researcher likely recruited participants who were easily accessible or willing to participate.