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Lecture 3

CMN 3102 Lecture Notes - Lecture 3: Descriptive Statistics, Frequency Distribution, Construct Validity


Department
Communication
Course Code
CMN 3102
Professor
Ivan Katchanovski
Lecture
3

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Lecture 3
Descriptive Statistics and Measurement
Descriptive Statistics
!Descriptive statistics
o!Describes data
o!Summarizes data
!Frequency distribution
!Measures of central tendency
o!Mode
o!Median
o!Mean
!Measures of variability/dispersion
o!Range
o!Standard deviation
o!Variance
Frequency Distribution
!Frequency distribution: percentage distribution of the variable of
interest
!Tables or charts that summarize the distribution of a variable
o!Frequency tables
!!Can be used for all types of variables
!!Valid Percent
o!Examples
!Frequency Table
o!
Frequency Graphs/Charts
!Graphs/charts can be used to illustrate frequency distributions
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o!bar charts
o!pie charts
o!line charts
o!histograms
!Examples
Graphic Description of Variables
!
Graphic Description of Variables
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