CH 2: Graphical Description of Data

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Last updated 1:43 AM on 6/7/26
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10 Terms

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Raw Data

list of all data values

  • Qualitative Data ex: Grades, A, B, C, D

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Frequency Distribution (f-)

the organization of raw data in a table form using classes (groups) and frequencies

  • f-

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f stands for?

the number of times a value appears in a certain data set

  • sum of all frequencies is = sample size

<p>the number of times a value appears in a certain data set</p><ul><li><p>sum of all frequencies is = sample size</p></li></ul><p></p>
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what does rf stand for?

Relative frequency: the number of times a value appears in a certain data set divided by the total number of values

  • sum of rf is 1

  • rf = f/n

<p>Relative frequency: the number of times a value appears in a certain data set divided by the total number of values </p><ul><li><p>sum of rf is 1</p></li><li><p>rf = f/n</p></li></ul><p></p>
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Pareto Chart

a type of bar graph

  • bars are arranged from largest to smallest

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Quantitative Groups needed?

  • Groups: data is spread with few repeats

  • No groups: data as many repeats and is a little spread

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<p>Histogram</p>

Histogram

type of bar graph

  • Vertical axis: frequency or relative frequency

  • Horizontal axis: data values in order

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<p>Polygon</p>

Polygon

line graph which is labeled as the histogram

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