1. Chapter 5 Classification and display of data

2. “Lies, damned lies and statistics”

3. “There are three kinds of lies: lies, damned lies, and statistics.” This phrase has been quoted in numerous articles and publications over the last 140 years, although it seems unclear when it was first used. What does it mean? TOK www

4. Types of data

5. There are two types of data: Discrete Continuous You could have data taking on any value between the highest and lowest values. So anywhere on the blue line would be a possible data value. This type of data can only take certain values. These can be integers or fractional values such as halves or quarters. But no numbers are allowed in between. If using integers, then only the red numbers would be possible data values. www

6. Bias

7. To conduct a survey, you take a sample from the population. A selection of people or objects – normally between 5% and 10% of the population The whole body of people or objects you wish to survey How should you do this?

8. You could select randomly… But this could create a biased view.

9. You could consider the population’s make-up and try to ensure that each group is represented proportionally…