data representation

• What do tables present?

  Lists of numbers or text in columns
• What type of data do bar charts show?

  Frequency data for discrete variables
• How are categories represented in a bar chart?

  Labelled across the X axis
• Where is frequency shown in a bar chart?

  Along the Y axis
• Why shouldn't the bars in a bar chart touch?

  Data comes from nominal data
• How does a histogram differ from a bar chart?

  Bars in a histogram touch each other
• What type of data does a histogram represent?

  Continuous data
• How many axes does a line graph have?

  Two axes
• What is a line graph composed of?

  Data points connected by straight line segments
• What is the purpose of scatter grams?

  To display the relationship between two co-variables
• What does a scatter gram indicate?

  It shows if there is a correlation
• Does a scatter gram imply a cause and effect relationship?

  No, it just shows a link