Non-parametric statistical tests describe the many ways in which statistics derived from observations on samples from study populations can be used to deduce whether those populations are truly different. Many statistical tests can be used for this purpose, which test is used depends on the type of data being analyzed and the number of groups involved. Each non-parametric statistical test includes assumptions about the data and the research design. As we explore non-parametric assumptions this week, it is important at this point to remember that statistical assumptions must be met before Ph.D. nurse researchers conduct any statistical analysis