By randomly splitting people into two groups, one of which receives an experimental intervention, researchers can set up potentially simple, unbiased comparisons between two approaches.
By randomly splitting people into two groups, one of which receives an experimental intervention, researchers can set up potentially simple, unbiased comparisons between two approaches.
做法是把一群人随机分为两组，其中一组接受试验性的介入，研究者便可以从事简易而无偏颇的比较。