If I was conducting a research study in nursing and I wanted to compare two groups on the basis of an outcome (e.g. pain levels), I would use a T-test, since these types of outcomes are usually assessed using ratio or interval scales, which is numerical values. For example, if I was running a nursing research study that sought to examine the differences between two populations on an outcome measure (e.g. pain levels), then I could use a t-test since these types of outcomes measures are usually measured using interval or ratio scales (i.e. numeric values).
Overall, understanding which statistical test requires what level of measurement is essential when designing and conducting quantitative research in nursing studies – as it ensures that correct inferences are drawn from these analyses afterwards by comparing results against appropriate standards and expectations accordingly.