Psychology 2810 Lecture 12: Lecture 12

• School: Western University
• Department: Psychology
• Course: Psychology 2810
• Professor: Tony Vernon

Document Summary

Le(cid:272)tu(cid:396)e (cid:1005)(cid:1006): signifi(cid:272)an(cid:272)e of the diffe(cid:396)en(cid:272)e (cid:271)etween two. Two-sample z-test and t-test example questions: subjects in a psychology experiment are randomly assigned to either an experimental or a control group. It is believed that the treatment received by the experimental-group subjects will result in their obtaining significantly higher scores, on average, than the control group subjects. It is assumed that students were originally randomly assigned to their sections. Perform the appropriate test on the following data using an alpha of . 05: (cid:1006) sa(cid:373)ple z test (cid:271)e(cid:272)ause (cid:1006) sa(cid:373)ples a(cid:374)d (cid:271)oth (cid:374)"s a(cid:396)e g(cid:396)eate(cid:396) tha(cid:374) (cid:1007)0. Two-sample confidence interval: thirty subjects are randomly assigned to one of two treatment groups. The investigators wish to see whether one group will obtain a significantly higher mean than the other but no specific prediction as to which group will score higher has been made.