Tables - Organising Data in Rows and Columns
A table arranges data into rows and columns, making it easy to read, compare, and interpret. Tables are one of the most powerful and flexible tools in data handling because they can display almost any type of information clearly.
One of the earliest examples of tables used for serious statistical analysis comes from John Graunt, a London merchant who in 1662 published Natural and Political Observations Made upon the Bills of Mortality – tables of weekly death records that let him spot patterns in causes of death and estimate the population of London for the first time, effectively founding the field of demography. Tables took a huge technological leap forward in 1979 with the release of VisiCalc, the first electronic spreadsheet program, which let ordinary users instantly recalculate entire tables of numbers after changing a single value; it is often credited with turning the personal computer from a hobbyist toy into an essential business tool almost overnight.
Parts of a Table
| Part | Description |
|---|---|
| Title | States what the table is about |
| Column header | Labels the data in each column |
| Row header | Labels the data in each row |
| Cell | A single data entry at the intersection of a row and column |
| Total row / column | Sums up the data in each column or row |
Two-Way Tables
A two-way table shows how data is split across two categories at the same time. For example, favourite sport vs. gender. Reading the correct cell gives the count for both categories combined.
Worked Examples
| Books read | Number of students |
|---|---|
| 0 | 3 |
| 1 | 8 |
| 2 | 12 |
| 3 | 7 |
| 4 or more | 5 |
| Total | 35 |
How many students read at least 2 books? 12 + 7 + 5 = 24 students.
| Football | Tennis | Swimming | Total | |
|---|---|---|---|---|
| Boys | 9 | 4 | 5 | 18 |
| Girls | 5 | 8 | 9 | 22 |
| Total | 14 | 12 | 14 | 40 |
How many girls prefer swimming? Read row Girls, column Swimming: 9.
Key Takeaways
- Tables organise data into rows and columns for easy reading.
- Always check that row and column totals agree (they should both sum to the grand total).
- A two-way table shows data split across two categories simultaneously.
- Read the correct row and column carefully – it is easy to misread a table.
Practice: Reading Tables
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