Distribution + correlation

• Normal distribution

  A symmetric distribution of values around the mean, sometimes called “the bell curve”.
• Positive correlation: 


  When one variable increases the other increases.
• Correlation coefficient:

  A value between -1 and 1 that indicates the relationship (correlation) between two data sets.
• Correlation:

  The extent to which two variables are associated.
• What type of distribution is this?

  Normal distribution

  
• What is normal distribution?

  A symmetric distribution of values around the mean, sometimes called “the bell curve”.
• What type of skew is the graph?

  Positive skew

  Mean is greater than median and mode

  
• What skew is the graph?

  negative skew

  Mean is lower than median and mode

  
• Define positive skew

  Most of the distribution is concentrated on the right
• Define negative skew

  Data distribution is concentrated on the left
• Skewed distribution:

  An asymmetric distribution of values of values around the mean, which can be positively or negatively skewed.