1. Section 1.2
Data Classification

2. Two Types of Data
Qualitative Data: consists of attributes, labels, or non-numerical entries.
Quantitative Data: Consists of numerical measurements or counts.
EX: Is the data Qualitative of Quantitative?
Carrying capacities of pick up trucks
Student ID numbers
Players numbers on a soccer team
Lengths of songs on MP3 player

3. Four Levels of Measurement
1. Nominal Level: Qualitative data organized using names, labels, or qualities. No mathematical computations are made at this level.
2. Ordinal Level: Qualitative or Quantitative data arranged in order (ranked), but differences between the categories are not meaningful.

4. 3. Interval Level: Quantitative data that is ordered
3. Interval Level: Quantitative data that is ordered. Meaningful differences between data entries can be calculated. A zero entry represents a position on a scale, and not an inherent zero.
4. Ratio Level: Quantitative data, similar to interval level, but a zero entry means an inherent zero. In other words, zero means NONE.

5. EX: Determine the type of data & the level of measurement.
19. The top 5 teams in the final football college poll released in Jan 2010 are:
1. Alabama 2. Texas 3. Florida 4. Boise St 5. Ohio St
24. The average ticket prices for 10 Broadway shows in 2009 are:
$149 $128 $124 $91 $96 $106 $112 $95 $86 $74