Inferential Statistics

• Skewed Distribution

  • The mode is the most frequent score SO will always be the highest point of a distribution.

  • The median is the middle point of the data.

  • The mean is the most affected as it takes all the values into account (either all the way right or left.)
• What is a Left/Negative Skew?

  The mean has moved to the left - it has become more negative.

  • The mean is SMALLER than the mode.
• What is a Right/Positive Skew?

  The mean has moved to the right- it has become more positive.

  • The mean is BIGGER than the mode.
• Is Skewed Distribution Parametric or Non-Parametric? 


  Non- Parametric.
• If significance of results is HIGH, the probability of results being due to chance is…

  Low.
• If significance of results is LOW, the probability of results being due to chance is…

  High.
• What does P< 0.05 mean?

  Probability that results are due to chance is equal to or less than 5%.

  • Means 95% chance that IV affected DV.
• What does P<0.01 mean?

  Probability that results are due to chance is equal to or less than 1%.

  • Means 99% chance that IV affected DV.
• What does P<0.001 mean?

  Probability that results are due to chance is equal to or less than 0.1%.

  • Means 99.9% chance that IV affected DV.