Raw data
Variable
Continuous variable
Discrete variable
Categorical Data
Extraneous Variable
Central tendency
Mean
Median
Mode
Weighted mean
Z-score
Spread
Range
Standard deviation
Variance
Quartiles
Interquartile range
Percentiles
Box and whisker plot
Frequency diagrams
Histogram
Frequency tables
Bar Graph
Frequency Polygon
Relative Frequency Distribution
Cumulative Frequency Distribution
Circle Graph (or Pie Chart)
Pictographs
Scatter plot
Index
Population
Sample
Simple Random Sample
Systematic Sample
Stratified Sample
Cluster Sample
Multi-stage sample
Voluntary-response sample
Convenience Sample
Bias
Sampling Bias
Non-Response Bias
Response bias
Measurement bias
Linear Correlation
Strong Correlation
Weak Correlation
Positive Correlation
Negative Correlation
Correlation Coefficient
Non-linear Regression
Cause-and-Effect Relationship
Reverse Cause-and-Effect Relationship
Accidental Relationship
Presumed Relationship
Experimental Group
Control Group
Common-cause Factor