Before you can interpret the numerical value of r, you need to determine if it was appropriate to calculate r to begin with. The Pearson correlation coefficient, r, describes the strength and direction of a linear relationship between two variables. The first step in exploring a linear relationship is to generate the scatterplot, which you learned about in the previous section.
New Smog Check Test Smog Check Program's Updated Test Technology Californians getting Smog Checks today may notice that the traditional tailpipe test used for many years has been replaced by a quicker, computer-based test for gasoline-powered cars model-year 2000 and newer, and for most diesel vehicles that are model-year 1998 and newer.
The state of California just made life. a bit easier for owners of hybrid vehicles. The Department of Consumer Affairs announced that all hybrids are. exempt from smog check inspections, at least until 2010. The exemption applies to the three hybrid models currently on the road ## the. Honda Insight, Honda Civic Hybrid and Toyota Prius ## and will be expanded as. new hybrid models are launched.