STT 212 Lecture Notes - Lecture 2: Dependent And Independent Variables, Block Design

• School: University of Rochester
• Department: Statistics
• Course: STT 212
• Professor: Mcdermott

Document Summary

Baking bread- factors are dme and temperature, factor levels x the # of factors. = # of treatments: control group- no treatment or standard treatment; baseline to compare new treatment to, placebo- looks like the treatment in smell, taste & image but has no acdve ingredient. Placebo e ect- psychological e ect; improved e ects with knowledge they are receiving treatment but really are not: single-blind study- people don"t know they are receiving placebo, double-blind study- padent & researcher both blind to who is receiving placebo. Subconsciously nd improvements even if they are not. Controlling confounding (extraneous) variables: direct control- know variables and can control them, blocking- (stradfying) homogeneous groups; treatment is tried in each block. Block on gender, in male block assign random treatment group & same for women: randomizacon- use random mechanism to assign into groups (extraneous factors are equally spread out into each group)