PSY 201 Study Guide - Quiz Guide: Null Hypothesis, Sampling Distribution, Standard Deviation

• School: Stony Brook University
• Department: Psychology
• Course: PSY 201
• Professor: Antonio Freitas

Document Summary

Z test vs. t test for 1 mean (cid:1011). (cid:1005) (cid:1009). (cid:1010)(cid:1009) (cid:1008). (cid:1009) (cid:1005)(cid:1004)(cid:1004) 3. 22 > 1. 96 so reject null hypothesis (cid:1005). (cid:1008)(cid:1009). (cid:1008)(cid:1009)= (cid:1007). (cid:1006)(cid:1006) Observed m = 7. 1; population = (cid:1009). (cid:1010)(cid:1009);population = (cid:1008). (cid:1009) Testing hypotheses about sample means when unknown. Ca(cid:374)"t si(cid:373)ply su(cid:271)stitute d for and use z! When n = , t = z. For media violence study, assume sd = 4. 40. (cid:1008). (cid:1008)(cid:1004) (cid:1005)(cid:1004)(cid:1004) = (cid:1005). (cid:1008)(cid:1009) (cid:1004). (cid:1008)(cid:1008)= (cid:1007). (cid:1007)(cid:1004) t test for one mean numerator and denominator (2 sources). ** t distribution has more variability than normal z distribution. Distribution in t varies from normal distribution more as sample size decreases. *samples with the same m will have the same z (only 1 source of variability - the numerator). * a(cid:373)ples (cid:449)ith the sa(cid:373)e m (cid:449)o(cid:374)"t al(cid:449)ays ha(cid:448)e the sa(cid:373)e t, because of the variability in both the.