PSYC 2021 Midterm: PSYC 2021 - Exam 3 Notes (Fall 2011)

• School: York University
• Department: Psychology
• Course: PSYC 2021
• Professor: Margarete Wolfram

Document Summary

Standard error of the mean: = / n. The smaller the , the more normal the distribution. Best estimate of 2 = 2 + . 2 = (ss / n) + (ss / n [n 1]) = ss / (n 1) Z scores can also be calculated using: z = (xbar ) / . H0 makes an explicit statement while the h1 makes a directional claim. H1 h0 z = (xbar as stated by h0) / . 2 where h1 is the alpha (the region of rejection) Type i error: h0 is rejected, but h0 is true. Type ii error: h0 is retained, but h0 is false. Type ii is temporarily passive, but wrongfully accepted. Alpha is the risk of making a type i error. Decreasing type i risk increases type ii risk. Chapter 8: testing hypotheses using a single sample. Standard error of the mean = (ss / n[n 1]) = schevron / n = s / (n 1)