PSYC 51a Lecture 9: PSYC 51A Lecture 9: Psyc 51A: Ch.9 Introduction to the t Statistic

• School: Brandeis University
• Department: Psychology
• Course: PSYC 51a
• Professor: Lee Yoona

Document Summary

For a one sample z test (comparing a sample to population) you have to know both and , and n must be > 30. Fro a one sample t test (comparing a sample to population), you only have to know . The sample s is used instead of . One sample z test vs one sample t test. Apply what you know from z to t test. The population that is sampled (sample) must be normal. In the z-test (from z to t tests the similarities and differences) Proportions are worked out between any two points within the distribution use a z- table to determine these proportions. From z to t tests the role of sample size. In the z-test, the critical z found in the unit normal table does not depend on n. In the t-test (from z to t tests the similarities and differences) Sm = estimation of standard error from the sample.