The nurse administrator is doing a study that entails gathering data about new employees over a 10-year period. Which research method would be the best one to use for this type of study?

A) Quantitative longitude cohort
B) Qualitative longitudinal
C) Qualitative interview
D) Qualitative case study

Quantitative research has been defined as being "focused on the testing of a hypothesis through objective observation and validation." The types of studies that make up this category include randomized controlled studies, cohort studies, longitudinal studies, case-controlled studies, and case reports. The other options are examples of quantitative, not qualitative, studies.