Chapter 2

Chapter 2 - MSIT 3000 Section 2.1 What Are Data? Data...

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MSIT 3000 Section 2.1 What Are Data? Data values or observations are information collected regarding some subject. Data can be numbers, names, etc., and tells us the “ Who and What ”. Data are useless without their context . Data are often organized into a data table like that below. 3
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The rows of a data table correspond to individual cases about Whom we record some characteristics. These characteristics may be collected on or about … respondents – individuals who answer a survey subjects or participants – people in an experiment The characteristics recorded about each individual or case are called variables . These are usually shown as the columns of a data table and identify What has been measured. MSIT 3000 Section 2.2 Variable Types 4
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categorical variable - places an individual into one of several groups or categories Note: Arithmetic operations, such as addition and averaging, are NOT meaningful for data resulting from a categorical variable. quantitative variable - takes numerical values for which arithmetic operations such as adding and averaging make sense Example: Identify each of the following as categorical or
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Chapter 2 - MSIT 3000 Section 2.1 What Are Data? Data...

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