# QMS 102 Lecture Notes - Lecture 1: Level Of Measurement, Qualitative Property

## Document Summary

Chapter 1 - types of data and measurement scales. Statistics is the science of collecting, organizing, presenting, analyzing and interpreting data to make informed decisions. Summarize, visualize and present data using tables, charts and diagrams. Statistics -: descriptive (qms 102, collecting, summarizing, visualizing, presenting, analyzing data, inferential (qms 202, data collected from a small group to draw conclusions about a larger group. Variable - a characteristic of an item or individual ex: weight, height, income. Data the set of individual values associated with a variable. Population all the items or individuals about which you want to draw a conclusion the large group . Sample the portion of a population selected for analysis the small group . Parameter a numerical measure that describes a characteristic of a population. Average, mean, variance of the population (large group) Statistic a numerical measure that describes a characteristic of a sample average, mean, variance of the sample (small group)