Juanita recruits participants for a study examining the impact of adrenaline on attraction. In her study she randomly assigns participants to either receive a placebo injection or an injection of adrenaline. All participants then rate the desirability of potential romantic partners. Juanita is conducting a(n) __ and the appropriate statistical test is a(n) _.a. correlation; ANOVA
b. three-group experiment; independent samples t-test
c. two-group experiment; independent samples t-test
d. observational study; correlation

A two-group experiment is designed to study the cause-effect relationship between any two variables.
In a two-group experiment, the researcher conducts a study on two groups - one of which is the control or the placebo group and the other one is the treatment group.
The study conducted by Juanita also consists of a group of participants of which one is a placebo group and the other is the group that has received adrenaline and hence this is a two-group experiment.
An independent samples t-test is applied when we need to make a comparison between two groups and thus, see the outcome of the statistical difference between the means of two groups or the two types of interventions used.
Since this test can be applied by Juanita this would be the most appropriate t-test to be used.