document.write( "Question 622970: A biopsychologist studies the role of the brain chemical serotonin in aggression. One sample of rats serves as a control group and recieves a placedo. A second sample of rats recieves a drug that lowers brian levels of serotonin. Then the researcher tests the animals by recording the number of aggressive responses each of the rats displays. the data are presented below:\r \n" );
document.write( "\n" );
document.write( "a. What are the null and alternative hypotheseses? \n" );
document.write( "b. Does the drug have a significant effect on aggression? use an alpha level of .05, two tailed.\r \n" );
document.write( "\n" );
document.write( "Low Serotonin \n" );
document.write( "N=4 \n" );
document.write( "M=22 \n" );
document.write( "SS-76\r \n" );
document.write( "\n" );
document.write( "Control \n" );
document.write( "N=8 \n" );
document.write( "M=14 \n" );
document.write( "SS=164 \n" );
document.write( "
![\"\"](\"/images/stars/stars-07.gif\")
