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1.1: Overview of Statistics

CHS Statistics. 1.1: Overview of Statistics. Objective : To briefly go over an overview of Statistics. Definition of Statistics.

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1.1: Overview of Statistics

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  1. CHS Statistics 1.1: Overview of Statistics Objective: To briefly go over an overview of Statistics

  2. Definition of Statistics • Statistics– a collection of methods for planning experiments, obtaining data, and then organizing, summarizing, presenting, analyzing, interpreting, and drawing conclusions based on the data. • Let’s look at two different ways to interpret the definition: • Statistics (the discipline) is a way of reasoning, along with collection of tools and methods, designed to help us understand the world. • Statistics (plural) are particular calculations made from data. • Common misconceptions of statistics: • Data are values with a context. (Datum is the singular form of data). People often confuse these with statistics. • Think about it: Common advertisements such as, “Don’t drink and drive; you don’t want to be a statistic” are often incorrect. Can you find the mistake?

  3. Population vs. Sample vs. Census • Population – the complete collection of all elements or subjects (scores, people, measurements, and so on) to be studied • Census – the collection of data from EVERY element in a population • Sample – a subcollection of elements drawn from a population • Examples: Population Sample Census

  4. Important Key Points Throughout Chapter 1 • Sample data must be collected in an appropriate way, such as through a process of random selection. • If sample data are not collected in an appropriate way, the data are useless.

  5. Population vs. Sample - You Decide! In a recent survey, 1000 of the 7126 students of the Seneca Valley School District stated that they liked the idea of starting school after Labor Day. • What is the population? • What is the sample?

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