An educational researcher plans to investigate the relationship between daily screen time and mathematics test scores across a large region. Before distributing a questionnaire to a representative sample of 2,000 2,000\,2,000 students, they administer it to a group of 30 students to test the clarity of the questions, estimate response times, and identify potential design flaws.
Which term correctly identifies this small-scale trial, and what is a primary statistical benefit of conducting it during the planning stage?
A pilot study; it helps identify ambiguities in the research design and can provide a preliminary estimate of variance to assist in calculating the required sample size for the main study.
A baseline assessment; it establishes a fixed control group so that causal relationships can be definitively proven before the main data collection begins.
A stratified trial; it guarantees that the final sample in the main study will be perfectly representative and entirely eliminates non-response bias.
A feasibility test; it replaces the need for random sampling in the main study by generating a standardized scaling factor.
