presenting data

• bar chart


  graphical representation used to display and compare frequency, count/ other measures for different categories/ groups

  each bar’s length/ height corresponds to its value
• histogram


  used for continuous data (e.g. age)

  there should be no space between the bar because data is continuous (e.g. 1-9, 10-19, 20-29, etc.)
• line graph


  a type of chart used to display data points connected by straight lines showing trends/ changes overtime / across categories

  effective for illustrating continuous data & tracking variations
• scatter diagram


  displays the relationship between 2 variables

  each point represents a single observation with values for both variables