A Researcher Placed Male Rodents in the Presence and Absence

Multiple Choice

A researcher placed male rodents in the presence and absence of a conspecific male.Cortisol (a stress hormone) levels were compared at both times.What type of t test is most appropriate for this study?

A) one-sample t test
B) two-independent-sample t test
C) related-samples t test
D) There is not enough information to answer this question.