APST 207 Lecture Notes - Lecture 1: Eye Color, Central Tendency
Document Summary
Statistics are a set of tools and techniques that allow us to collect,organize, and interpret data and analyze the relationship between pieces of data. A variable is a characteristic or property we"re interested in. If variable is categorical, each answer categories are called classes or levels. Variables describe experimental units (or cases) and vary by experimental units (individuals, groups, companies, countries) Qualitative variables are not-numerical (they only exist in discrete whole units and result from descriptions) Quantitative variables are numerical (they can be order or ranked- obtained by counting or measuring and are discrete or continuous) Discrete variables: can be assigned values like 1,2,3 4 and are accountable. Value is obtained by counting e. g # of students in a class. Continuous variables can assume all values between 2 values. Value is obtained by measuring temperature, height, weight. Variables apply to experimental units or cases. We collect data so we can describe a population. The entire set of something = n.
