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handout_1_1 - Chapter 1 Introduction statistics- the...

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Chapter 1 Introduction statistics - the science of learning from data data are numbers with a context- must know your field measurements from study are of little value without tools of statistics individuals - objects described by set of data (people, things…) variable - any characteristic of an individual categorical variable - places an individual into one of several groups or categories EX- gender, race, ethnicity… quantitative variable - takes numerical values for which arithmetic operations (adding, averaging…) make sense EX- test scores, income… can convert a quantitative variable into a categorical variable distribution - tells us what values a variable takes and how often it takes those values Chapter 1- descriptive statistics (do inferential statistics later) Section 1.1- describe data set graphically Section 1.2- describe data set numerically
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1.1 Displaying Distributions with Graphs Bar Graphs •use for categorical variables •plot count or percent on vertical axis versus categories on horizontal axis
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handout_1_1 - Chapter 1 Introduction statistics- the...

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