Sample
Portion of the population being studied
Random sample
A sample in which each element in a population has an equal chance of being selected
Biased sample
A sample in which method used to form results are not representative of entire population
Data collection methods
Survey Published data Experiment Observational study Simulation
Graphs that display qualitative data
Venn diagram
Two way frequency table
Graphs that display quantitative data
Dot plot
Histograms
Box plots