Scenario: An I$/$O researcher wants to know if there is a difference among management types $($authoritative$,$ persuasive, or paternalistic$)$ on average length of time employees stay with a company $($measured in years$).$ He collects this information from $100$ companies. Assume the data meets assumptions for a parametric test. Question: What is the independent variable in this scenario?

Group of answer choices

Management type

Average length of employment

Company type

Employee happiness