# MATH 1150 Lecture Notes - Lecture 1: Human Hair Color, Categorical Variable, Level Of Measurement

## Document Summary

Statistics: science of collecting and analyzing data to answer questions and draw. Uses: back up or disprove a belief, find patterns, help predict future trends conclusions. Variation: differences of changes between people, objects, or whatever you"re investigating. Always explain context and keep it in mind. Numerical data: describe quantity of the object of interest. Categorical data: describe the quality of the object. Categorical variable can be written as numbers. Variable is a characteristic of each object. Statistics is a number or result we get from analysing data. Population: entire group that we"re interested in studying. Getting data on the whole pop. is usually impossible. Sample: smaller group of people or objects that we actually have data about. Each row has several variable of one individual. Two way table: shows how many times each combination of categories occur. Make sure you have enough information to accurately answer the question. Anecdotes: a story that someone tells about their experience.