The area under the normal curve to the right of μ equals _______ .

Intro to Statistics (STAT 201) Notes 1/15/19 Chapter 1 (1.2) Data in a Context When the data are organized, given labels, and put into a context, the data gain meaning Sample and Population The goal is to describe a population o This is usually impractical or impossible A sample is used to make inferences about the population The sample should be representative of the possible Types of Variables Categorical – Variable that determines demographics o Ex: Name, Gender, Race, etc. Quantitative – Variable that determines results o Ex: Time of finish of each person that finishes the race Ordinal – Typically considered a subcategory of “Categorical” o Ex: Place finished in the race, Race Number (Race #1, Race #2, Race #3) Identifier – Variable that identifies a row o Ex: Number given to each person that runs a marathon. Number is given to identify the runner Chapter 2 Need to Know Symbols and Abbreviations R – Range s – Standard Deviation o Measures Variation x – Average IMPORTANT FOR QUIZZES & TESTS: In the absence of any other information, the average is the best predictor of the future The further away numbers are from the average, the greater the standard deviation will be Describing a Distribution of Numbers Shape o Does the histogram have a single, central hump or several separated humps “Humps” more commonly referred