1.Explain when a z-test would be appropriate over a t-test.
2.Researchers routinely choose an alpha level of 0.05 for testing their hypotheses. What are some experiments for which you might want a lower alpha level (e.g., 0.01)? What are some situations in which you might accept a higher level (e.g., 0.1)?
reference; Statistics for Nursing Research: A Workbook for Evidence-Based Practice