distributions

• What is the term for the common distribution of data in statistics?

  Normal distribution
• What are the characteristics of a normal distribution?

  • Symmetrical curve
  • Mean, median, and mode are equal
  • Sides do not touch the x-axis
• What does the y-axis represent in a histogram?

  Frequency
• What does the x-axis represent in a histogram?

  Value of the scores
• What is the mode in a distribution?

  The most common score
• How is the median defined in a normal distribution?

  It is the middle score
• What does a symmetrical curve indicate about the scores?

  Equal distribution on both sides
• What are the characteristics of skew distributions?

  • Scores shifted to one side
  • Long tail either to the right (positive skew) or left (negative skew)
  • Not symmetrical
• What indicates a positive skew in a distribution?

  Long tail pointing to the right
• What indicates a negative skew in a distribution?

  Long tail pointing to the left
• How can a test's difficulty affect its score distribution?

  Easy tests lead to negative skew
• How does the mean relate to extreme scores in skew distributions?

  It is pulled towards the tail
• Where is the median located in a skew distribution?

  Between the mode and the mean