PY 211 Lecture 10: Chapter 8

• School: University of Alabama
• Department: Psychology
• Course: PY 211
• Professor: Beverly B Roskos- Ewoldsen

Document Summary

Descriptive vs. inferential: descriptive describes characteristics (ct, var) of a set of scores (table, graph) Inferential procedures used for generalizing observations within sample to population from which it came. Statements about the value for a population parameter. Statements that can be tested using the research method: hypothesis testing (significance testing) Method for testing a hypothesis about a population parameter. Determine the likelihood that a sample statistic would be selected, given the population parameter. Sample looks like original distribution (high probability: alternative. Sample does not look like original distribution (very low probability) Null: sample looks like (polluted) population (high probability) Alternative: sample looks nothing like the population (low probability) Null: sa(cid:373)ple looks like (cid:862)high pai(cid:374)(cid:863) populatio(cid:374) (cid:894)high pro(cid:271)a(cid:271)ility(cid:895) Alter(cid:374)ati(cid:448)e: sa(cid:373)ple looks (cid:374)othi(cid:374)g like the (cid:862)high pai(cid:374)(cid:863) populatio(cid:374) (cid:894)lo(cid:449) probability) Therapy helps: learning, sleeping & memory. Null: sa(cid:373)ple looks just like (cid:862)(cid:374)o sleep(cid:863) populatio(cid:374) (cid:894)high pro(cid:271)a(cid:271)ility(cid:895) Alter(cid:374)ati(cid:448)e: sa(cid:373)ple looks (cid:374)othi(cid:374)g like the (cid:862)(cid:374)o sleep(cid:863) populatio(cid:374) (cid:894)lo(cid:449) probability)