What is a crucial factor in selecting a sample for research?

Randomization is a crucial factor in selecting a sample for research because it helps ensure that the sample is representative of the larger population. This process minimizes selection bias and allows for a more valid generalization of the research findings. By randomly selecting participants, each individual has an equal chance of being included in the sample, which results in a diverse group that reflects the population's characteristics. This is essential for achieving external validity in research, as it supports the reliability and applicability of the results across various contexts and groups.

Other factors, such as monetary cost, location of participants, and the researcher's preferences, do hold importance in the sampling process but primarily pertain to practical considerations rather than foundational principles of sample selection. For instance, while budget constraints might limit the ability to reach a wider pool of participants, and participant location may affect accessibility, neither compromises the fundamental integrity of the randomization process that ensures unbiased and valid outcomes.