BUS 215 Lecture Notes - Lecture 2: N100, Sampling Frame, Statistical Parameter

• School: Stony Brook University
• Department: Business Management
• Course: BUS 215
• Professor: herbertlewis

Document Summary

Population and samples: a population includes all objects of interest in a study, people, machines, products, investments, a sample is a representative subset of a population; usually chosen randomly. Variables and cases: a variable (or field) is an attribute or measurement on members of a population, gender, age, height. A case (or observation or record) is a list of all variable values for a single member of a population. Types of variables: a qualitative variable is a nonnumeric attribute, nominal or ordinal, a quantitative variable is a numeric attribute, interval or ratio, discrete or continuous. Strictly a label with no natural order: qualitative variables, classify and count, cannot add, subtract, multiply, or divide, examples, names of people, car manufacturers, product color. Ordinal variables: qualitative variables, values form a natural order, classify, count, and rank, cannot add, subtract, multiply, or divide, examples, agree/disagree responses, rating levels (superior, good, satisfactory, poor)