 
Summary: Math 140
Introductory Statistics
Professor B. Ábrego
Lecture 3
Summary Statistic
Consider as an example of our analysis Round 2 of the layoffs.
To simplify the statistical analysis to come, it will help to
"condense" the data into a single number, called a summary
statistic. One possible summary statistic is the average, or
mean, age of the three who lost their jobs:
20 25 30 35 40 45 50 55 60 65
yearsaverage 58
3
645555
=
++
=
Martin v. Westvaco
Martin: Look at the pattern in the data. All three of the workers
laid off were much older than the average age of all workers.
