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Chapter 1 The Nature of Probability and Statistics Chapter 1 Overview Introduction 1-1 Descriptive and Inferential Statistics 1-2 Variables and Types of Data 1-3 Data Collection & Sampling Techniques 1-4 Observational and Experimental Studies 1-5 Uses and Misuses of Statistics 1-6 Computers and Calculators Bluman Chapter 1 2 Introduction Statistics is the science of conducting studies to collect, organize, summarize, analyze, and draw conclusions from data. Bluman Chapter 1 3 Section 1-1 Inferential and Descriptive Statistics Objective 1: knowledge of statistical terms A variable is a characteristic or attribute that can assume different values. The values that a variable can assume are called data. Random variable: Any variable whose value is determined by chance. Objective 1: knowledge of statistical terms A collection of data values forms a data set. Each value in the data set is called a data value or datum. Objective 2: Two Branches of Statistics Statistics Descriptive Statistics Inferential Statistics Objective 2: Two Branches of Statistics Statistics Descriptive Statistics consists of: the collection, organization, summarization, and presentation of data. Inferential Statistics consists of: 1. generalizing from samples to populations 2. performing estimations and hypothesis tests. 3. determining relationships among variables 4. making predictions. More terms to know A Population consists of all subjects ( human or otherwise) that are being studied. A Sample is a group of subjects from a population. On your own Read section 1.1 Do Applying concepts on page 5 Due next time class meets. Bluman Chapter 1 12