Aresearcher conducts an independent-measures study examining how the brain chemical serotonin is related to aggression. one sample of rats serves as a control group and receives a placebo that does not affect normal levels of serotonin. a second sample of rats receives a drug that lowers brain levels of serotonin. then the researcher tests the animals by recording the number of aggressive responses each of the rats display. the data are as follows. control low serotonin n = 10 n = 15 m = 14 m = 19 ss = 180.5 ss = 130.0 a. does the drug have a significant effect on aggression? use an alpha level of .05. show all 4 steps - you do not have to include formulas but must state hypotheses, critical value, pooled variance, standard error of m, t value, and decision to reject or fail to reject the null.