M50%2BNotes%2BCh01 - Stat 50 Chapter 1 Introduction to...

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Stat 50 Chapter 1 Section 1-1 Introduction to Statistics Section 1-1 Page 1 OBJECTIVES s Demonstrate knowledge of statistical terms. s Differentiate between the two branches of statistics. s Identify types of data. s Identify the measurement level for each variable. s Identify the four basic sampling techniques. s Explain the difference between an observational and an experimental study. s Explain how statistics can be used and misused. s Explain the importance of computers and calculators in statistics. s Data are observations (such as measurements and survey responses) that have been collected or observed. s Statistics is the science of conducting studies to collect, organize, summarize, analyze, and draw conclusions from data. o Descriptive statistics consists of the collection, organization, summarization, and presentation of data. o Inferential statistics consists of generalizing from samples to populations, performing estimations hypothesis testing, determining relationships among variables, and making predictions. ( Probability, Hypothesis testing, relationships between variables, predictions ) s Probability is the chance of an event occurring. s A population consists of all subjects that are being studied. s A sample is a group of subjects selected from a population. s A census is the collection of data from every member of the population
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Stat 50 Chapter 1 Section 1-2 Introduction to Statistics Section 1-2 Page 2 Variables and Types of Data In order to gain knowledge about seemingly haphazard events, statisticians collect information for variables that describe the events. s A variable is a characteristic or attribute that can assume different values. s Data are the values that variables can assume. s
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This note was uploaded on 09/08/2010 for the course STAT 1437 taught by Professor Stat during the Summer '10 term at Pasadena City College.

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M50%2BNotes%2BCh01 - Stat 50 Chapter 1 Introduction to...

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