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Chapter 5 · Data Analysis: A Concise Overview of Statistical Techniques · Slide 162/274

Tables

Discrete Variable is a quantitative variable that has either a finite number of values or an infinitely countable number of values (e.g. 0, 1, 2, 3, …).

5.1.2 · Organizing Quantitative DataTables

Tables

Collected Data
22245333321235343123532132
Number of ChildrenFrequencyRelative Frequency
133/26 ≈ 0.12
288/26 ≈ 0.31
31010/26 ≈ 0.38
422/26 ≈ 0.08
533/26 ≈ 0.12

Discrete Variable is a quantitative variable that has either a finite number of values or an infinitely countable number of values (e.g. 0, 1, 2, 3, …).

Sometimes there are too many values to create a row for each value. In that case, several values are combined into groups (classes).

Collected Data
62876758959491695276828591607772837963887988707575
Points on the ExamFre­quency
Lower Class Limit → 50–59 2
Upper Class Limit → 60–69 5
70–79 7
Class Width = 90 − 80 = 10 → 80–89 7
90–99 4
QUESTIONSTAR · Dr. Paul Marx162 / 274
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