quartile for ungrouped data

• Measures of position

  • give us a way to see where a certain data point or value falls in a sample or distribution.
  • used for quantitative data that falls on some numerical scale.
  • The most common are quartiles, deciles, and percentiles
• quartiles - points that divide the data into four equal parts
• In quartiles, each part is equal to a quarter of data.
• first quartile - lower quartile
• Second Quartile - median
• Third Quartile - upper quartile
• Interquartile Range (IQR)

  • It is the difference between the third quartile and the first quartile.
  • gives the measure of spread out around the center data.
  • It tells where you will find the middle 50% of the data