Change in variability

1
Change in variability
Bill Diplas, source www.fedstats.gov
2
Change in variability
Bill Diplas, source www.fedstats.gov
3
Counterintuitive relation
PAUL STEGALL, source Asking friends
4
Counterintuitive relation
PAUL STEGALL, source Asking friends
5
Counterintuitive relation
Brian Ejsmont, source http//hybridcars.about.com
6
Counterintuitive relation
Brian Ejsmont, source http//hybridcars.about.com

7
Intuitive relation
Gas Price vs. Amtrak NEC Ridership
14.5
14
13.5
13
12.5
Amtrak NEC Ridership (millions)
12
11.5
11
10.5
1.200
1.300
1.400
1.500
1.600
1.700
1.800
1.900
2.000
Average Gas Price (/gal)
Ben Pressman, sourcewww.narprail.org and
www.bls.gov
8
Intuitive relation
Ben Pressman, sourcewww.narprail.org and
www.bls.gov
9
Multiple sources of variability
George Karikas, source Road Test Summary of the
November 2006 edition of Road and Track Magazine.

10
Multiple sources of variability
George Karikas, source Road Test Summary of the
November 2006 edition of Road and Track Magazine.

11
Limiting behavior
Kelly Dyer, source www.collegeboard.com
12
Limiting behavior
Kelly Dyer, source www.collegeboard.com