Question

Year	Number of Alternative-Fueled Vehicles in US
2000	394,664
2001	425,457
2002	471,098
2003	533,999
2004	565,492
2005	592,125
2006	634,562
2007	695,766

1. Construct a scatter diagram of year (x) vs number of Alternative-fueled vehicles in US (y). Do these variables appear to have a relationship? Write 2 or 3 sentences describing the relationship or lack of a relationship. Explain your reasoning. (9 points for graph and 9 points for description of relationship or lack of relationship)

2. Description of the relationship of data.

Answer 1

The scatter diagram is :

There is strong positive linear relationship between the Number of Alternative-Fueled Vehicles in US and the Year.

As year increases, Number of Alternative-Fueled Vehicles in US has also grown linearly. There is a very strong association between the two variables. The correlation is actually close to 1. This can be seen in the above graph clearly. As year increases, Number of Alternative-Fueled Vehicles in US also increase. The slope of this line is positive.

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