Descriptive Statistics Skewness And Kurtosis. A normal distribution has a kurtosis of 3. A symmetrical data set will have a skewness equal to 0.
Just as the mean and standard deviation can be distorted by extreme values in the tails so too can the skewness and kurtosis measures. Look ahead at the instructions and scoring guide for the Unit 3 assignment so that you have it in mind as you study the materials and complete the activities in this unit. A symmetric distribution such as a normal distribution has a skewness of 0 and a distribution that is skewed to the left eg.
The age of participants ranged from 18 to 70 years M 255 SD 794.
Descriptive Statistics Means and standard deviations should be given either in the text or in a table but not both. If the skewness is negative then the distribution is. Age was non-normally distributed with skewness of 187 SE 005 and kurtosis of 393 SE 010. The average age of participants was 255 years SD 794.
