elem stat chap 2-5

elem stat chap 2-5 - Chapter 2 Data What is data...

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Chapter 2: Data: What is data? Quantitative and categorical To find data there are 5 steps: Who? (Rows) customer records, survey participants, subjects What? (Categorical or quantitative) data we are concerned with Where? Was the data collected When? Was the data collected Why? Was this data collected How? Was this data collected Chapter 3: displaying and describing categorical data Goal is to present data in order as much as possible Put everything into piles Frequency table A frequency table shows how the total is distributed among the categories We can also consider distribution as a percentage of where the table we make is called a relative frequency table. There are two ways to display a single categorical Variable bar chart Pie chart Bar chart The area of a region in the graph must correspond to the magnitude of the value it represents (can not be wider then the others or thinner) Pie chart The advantage is we can easily see that freshmen are greater > sophomore, junior, senior Disadvantage is cannot rely to tell you if there are more sophomore then junior Class count Fresh 495 Soph 148 Junior 116 Senior 84 Total 843 Class count Fresh 58% Soph 17% Junior 13% Senior 9% Total 843
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If we want to look at 2 variables of the students then we will form a contingency table
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elem stat chap 2-5 - Chapter 2 Data What is data...

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