M3.7.1 For the adult
Collecting data
Ten friends gave me ten different answers to my survey. What went wrong?
What this chapter teaches
A survey needs a clear question. Answers are sorted into classes with no gap and no overlap, and then counted. Counted data is whole numbers. Measured data can be any size.
Three questions to ask
There is no one right wording. Listen for the idea.
- What makes "How do you travel?" a weak survey question?
- Where does the answer 10 go if the classes are 0 to 9 and 10 to 19?
- Is the height of a plant counted data or measured data? Why?
After the chapter, the learner can
- Write a clear question for a survey
- Group data into classes like 0 to 9 and 10 to 19
- Tell counted data from measured data
What they copy into their notebook
A clear survey question asks about one thing and has answers you can count. Classes have the same width, no gap and no overlap. Counted data is whole numbers. Measured data can be any size.