215 Handout_2(chapter 2) - Handout #2: Turning Data Into...

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Handout #2: Turning Data Into Information (Chapter 2) STA215: Introductory Applied Statistics Dr. Jann-Huei Jinn 1. Population : a collection of all individuals (subjects) about which information is desired. 2. Random sample : a subset of the population selected so that every individual has a specified probability of being part of the sample. Example: (Exercises 2.3, 2.4) 3. Population parameter is a number characterizing population (e.g. population mean μ ). It is usually unknown. 4. Sample statistic is a number computed from the sample (e.g. sample mean x ). It is used for estimating the population parameter. Statistic is random , that is, for any other sample you collect, the value of statistic will be different. Example: (Exercises 2.5, 2.6) 5. Variable : any characteristics of an individual (subject) in the population. 6. Two types of variables (Two types of data): a. Categorical (qualitative, attribute) variable b. Numerical (quantitative) variable Examples: (Exercises 2.11, 2.13)
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215 Handout_2(chapter 2) - Handout #2: Turning Data Into...

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