BUS 082 Lecture Notes - Lecture 25: Interquartile Range, Quartile, Box Plot

• School: College of The Sequoias
• Department: Business (BUS)
• Course: BUS 082
• Professor: bettencourt

Document Summary

Quartiles split into 4 segments with equal number of values in each. Q1 is where 25% are smaller, 75% are larger, q2 is median, q3, only 25% of observations are greater. When calculating the ranked position, use the following rules if result is a whole number (9+1)/4 = 2. 5, use the average of two corresponding data values. If result is not a fraction or whole number, round result to nearest integer. The example answer is in between 12 and 13, so its 12. 5. Q2 is a measure of central tendency as its median. The iqr is q3-q1, and measures the spread in the middle 50% of data. It is a measure of variability not influenced by outliers, and along with q1 and q3, it is referred to as a resistant measure. The 5 numbers that help describe the centre, spread and shape of data are: Is a graphical display of the data from the 5 number summary.