## 7.9 Sem-average

Year Production
2001 11
2002 9
2003 10
2004 16
2005 12
2001 7
2002 8
2003 6
2004 15
2005 3

Steps

1. Separate the data into two equal parts (if odd-numbered, omit middle-most)
2. Estimate averages of each group
3. Put these two values on the scatter plot and extend