Lecture4[1] - Lecture 4 Summary Statistics Mean Median Mode Percentiles Quartiles IQR Sections 3.1 3.2 3.4 STAT 225 Dallas Bateman Spring 2010 1

# Lecture4[1] - Lecture 4 Summary Statistics Mean Median Mode...

• Notes
• 15

This preview shows page 1 - 7 out of 15 pages.

Summary Statistics: Mean, Median, Mode, Percentiles, Quartiles, IQR Sections 3.1, 3.2, & 3.4 1 STAT 225, Dallas Bateman, Spring 2010 Lecture 4
Measures of Location Mean Median Mode Percentiles Quartiles 2 STAT 225, Dallas Bateman, Spring 2010
Mean Average Value Sample Mean Population Mean STAT 225, Dallas Bateman, Spring 2010 3 i x x n i x N
Median Value in the middle when the data are arranged in ascending order (smallest to largest). With an odd number of observations, the median is the middle value. With an even number of observations, having no middle value, the average of the two middle values is the median. 4 STAT 225, Dallas Bateman, Spring 2010
Mode The value that occurs with greatest frequency (may be more than one mode in a set of data). Sort the data and search for the value that occurs most often 5 STAT 225, Dallas Bateman, Spring 2010
Mean, Median, or Mode? Mode Report the mode for nominal data