1. Data Classification
Lesson 1.2

2. Types of Data
Qualitative data consist of attributes, labels, or nonnumerical entries
Quantitative data consist of numerical measurements of counts

3. Levels of Measurement
Nominal
Ordinal
Interval
Ratio

4. Nominal Level of Measurement
Data is qualitative
Categorized using names, labels or qualities
This data cannot be used for mathematical equations.

5. Ordinal Level of Measurement
Qualitative or quanitative
This data can be arranged in an order
Differences between data entries have no real meaning

6. Interval Level of Measurement
Data can be ordered
You can calculate meaningful differences between entries
Zero is a position on a scale but in not an inherent zero

7. Ratio Level of Measurement
Same as interval with a real zero
Two data values can be formed so one value can be expressed as a multiple of another.

8. Inherent Zero An inherent zero is a zero that implies “none.”
When unsure between ratio and interval, ask yourself what the meaning of a zero is.

9. Our Data Collection Gender Height in inches Money in wallet
Hours you work
Eye color
Shoe size
Ideal temperature
Grade in math class

10. Data collection
In doing data collection, if I asked how many extracurricular activities you were involved in. What level of measurement is this?
If I had asked “What extracurricular activities are you involved in?”, what level of measurement is this?

11. Exercises
Pg 13-14, #1-6 all, 7-21 odd