Lecture #2 Flashcards
1
Q
Probability def.?
A
Math tool used to study randomness
2
Q
A statistic vs a parameter?
A
A statistic is a number that represent a property of the SAMPLE.
A parameter is a number that is a property of a POPULATION.
3
Q
Frequency distributions?
A
Organized and displayed raw data
4
Q
Relative f?
A
Each f expressed as a fraction
5
Q
Percent f?
A
Express each f out of 100
6
Q
Cumulative f?
A
Total number/proportion below a certain value. Always from lower class to higher class.
7
Q
Cumulative percentage f?
A
Cumf * 100
8
Q
Bivariate f distribution?
A
2 measures per observation
9
Q
Bivariate relative f distribution?
A
f/total f
10
Q
Graphical representation?
A
- Bar chart: F represented by height.
- Histogram: f represented by area
- Polygon: Histogram with line joining each midpoints of the class intervals.
