Outliers

• What is the concept discussed in the video?

  Outlier
• How is an outlier defined in a data set?

  By testing if a data value is extreme
• In which topic is the concept of outliers found?

  Descriptive statistics
• What was the previous video about before this one?

  Quartiles and interquartile range
• What is the process to determine if a data value is an outlier?

  • Calculate upper quartile (Q3)
  • Calculate interquartile range (IQR)
  • Use the formula: Q3 + 1.5 * IQR
  • Compare the data value to the result
• What were the heights of the basketball players?

  160 cm, 177 cm to 195 cm, 205 cm
• Why was the 205 cm player initially considered an outlier?

  Because of their extreme height compared to others
• What is the formula to test if a large data value is an outlier?

  Q3 + 1.5 * IQR
• What does it mean if a data value is greater than 197 cm?

  It is considered an outlier
• What is the cutoff point for determining if the 205 cm player is an outlier?

  197 cm
• What is the formula to test if a small data value is an outlier?

  Q1 - 1.5 * IQR
• What should you do to determine if the 160 cm player is an outlier?

  Calculate the cutoff point using Q1
• What are the steps to test if a lower end data value is an outlier?

  1. Calculate lower quartile (Q1)
  2. Calculate interquartile range (IQR)
  3. Use the formula: Q1 - 1.5 * IQR
  4. Compare the data value to the result