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Column Variable

1

2

Total

Row Variable

1

Count or percentage for row 1, column 1

Count or percentage for row 1, column 2

Total for row 1

2

Count or percentage for row 2, column 1

Count or percentage for row 2, column 2

Total for row 2

Total

Total for column 1

Total for column 2

Overall total

Each cell in the inner part of the table represents the count or percentage of a pairing, or cross-classifying, of categories from each variable. Sometimes additional rows and columns present the percentages of the overall total, the percentages of the row total, and the percentages of the column total for each row and column combination.

Two-way tables can reveal what combination of values is most prevalent in data. In the example, the tables reveal that bad wafers are much more likely to have particles than the good wafers. Because the number of good and bad wafers was unequal in this example, you can best see this pattern in the Row Percentage table. That table shows that nearly three-quarters of the wafers that had particles were bad, but only 20% of wafers that did not have particles were bad.

5. Complete the following sentences:

  • You present categorical data by…

  • The count, amount, or percentage of responses by category is placed …

  • Summary tables enable you to …

  • The length of each bar represents …

  • Pie slices represent the count, amount, or percentage of …

  • You may produce your pie charts using ….

  • A superimposed plotted line in the Pareto diagram represents …

  • Pareto diagrams enable you to …

  • Cross-classification tables are also known ….

  • Each cell in the inner part of the table represents …

  • Two-way tables can reveal what combination ….

6. Ask 10 general questions to the text.

7 Answer the following questions:

  • How do you present categorical data?

  • What is a summery table?

  • What are additional columns for?

  • What is a bar chart?

  • Why is scanning a bar chart easier than scanning a summary table?

  • What is a pie chart?

  • How can you produce a pie chart?

  • How can you produce a pie chart using a protractor?

  • What is a Pareto diagram?

  • What is a two-way cross-classification table?

  • What does the simplest two-way table have?

  • What do additional rows and columns present?

8. Agree or disagree with the following statements. Use the expressions:

That is wrong That is right.

Far from it. I agree with you.

Nothing of the kind Quite right

  • Categorical data are presented by sorting responses by categories.

  • The count, amount, or percentage of responses by category is placed into a summary table or into one of several forms of charts.

  • The summery table is a multicolumn table that presents the count or percentage of responses to two categorical variables.

  • Summary tables enable you to see the big picture about a set of data.

  • A bar chart is a circle chart in which wedge-shaped areas represent the count, amount, or percentage of each category and the entire circle represents the total.

  • The Pareto diagram is a chart containing rectangles (“bars”) in which the length of each bar represents the count, amount, or percentage of responses of one category.

  • You can produce a pie chart using computers, calculators or a protractor.