distribution

• What do distribution graphs show about data?

  How the data is spread around the mean
• What shape is the classic curve for normal distributions?

  Bell shaped curve
• What does the width of the normal distribution curve indicate?

  How spread out the data is
• Where does the mean lie in a normal distribution?

  At the mid point
• What is an example of data that can be normally distributed?

  IQ graphs
• What are the ways to check if data is normally distributed?

  1. Examine data visually for clustering around the mean
  2. Calculate mean, median, and mode for similarity
  3. Plot data on a histogram for bell-shaped curve
• What should you look for when examining data visually for normal distribution?

  If most scores are around the mean
• How can you check the similarity of mean, median, and mode?

  Calculate each value and compare them
• What does plotting data on a histogram help determine?

  If it forms a bell-shaped curve
• What are skewed distributions?

  Distributions with outliers affecting the shape
• What are outliers in data?

  Extreme scores that can skew the distribution
• What effect does an extreme low score have on distribution?

  It results in a negative skew
• How does a negative skew affect the mean, mode, and median?

  Mean is lower than mode and median
• What effect does an extreme high score have on distribution?

  It results in a positive skew
• How does a positive skew affect the mean, mode, and median?

  Mean is higher than mode and median