A t-statistic and z-score.

1. The first problem in analyzing data is determining the appropriate statistical test. Under what circumstances is a t-statistic used instead of a z-score in a hypothesis test? Give an example of both a t-statistic and z-score. 2. When might you use a one-independent sample t-test versus a two-independent samples t-test when conducting hypothesis testing? Provide an example of each for a proposed research study.