PSYC 2002 Lecture Notes - Lecture 2: Unimodality, Decimal Mark, Psychophysics
Document Summary
For a lot of kinds of research, you often need hundreds of people in your study in order to generalize effectively. Small samples make it harder to replicate a study. Discrete and continuous: variable: something that can change. Scales: developed by s. s. stevens, nominal: apply a name to something. Assigning to categories: very simple, plotting into categories, observations are categorized, ex. Types of professions, political affiliation: ordinal: some kind of ranking component. Not paying attention to how close the ranks are: race times (first, second, third), observations are rank ordered, ex. Ranking of universities, top 200 recordings, lowest to highest: the difference between two things can be large or very small (time difference between first and second place). Interval: equivalent sizes between each category: all categories have the same size, ex. Temperature measurements: ratio: has an absolute zero, has the most information, ex. Kelvin temperature, response time, percent correct: 0 can actually be something that is measured.
