data analysis: graphs

• tables 


  raw scores are converted to descriptive statistics and summarised in a table
• bar charts


  discrete categorical data represented for clear comparison

  the frequency of each category is the height of the bar
• scatter grams


  shows the strength and direction of a relationship between co-variables
• normal distribution


  bell curve

  mean, median and mode at some point

  tails never touch zero
• skewed distributions


  negative skew leans right

  positive skew leans left