Data Presentation Flashcards
How to present numerical (quantitative) data?
Using frequency distribution (e.g histogram) and stem and leaf diagram
How to present qualitative data?
Using frequency table such as Pareto chart, pie chart and bar chart.
3 graphic forms of presenting frequency distribution?
- Histogram
- Frequency polygon
- Cumulative frequency distributions
How is frequency polygon constructed?
Using midpoint and frequency
Center
Middle (average) value of a data set
Variation
Values vary among themselves.
Distribution
Shape of distribution of data
Outliers
Values that lie far from vast majority
Time
Changing characteristics of data over time
Measures of location
- Arithmetic mean
- Weighted mean
- Median
- Mode
Measures of dispersion
- range
- standard deviation
- mean deviation
- variance
Properties of arithmetic mean
- mean is affected by large or small values
* sum of deviations of each value is 0
Elements of central tendency
Mean, median, mode
Elements of variation
Range, variance, standard deviation
Right skewed distribution
Positive, mean > median
