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Technology Californians getting Smog Checks today may notice that the traditional tailpipe test used for many years has been replaced by a quicker, computer-based test for gasoline-powered cars model-year 2000 and newer, and for most diesel vehicles that are model-year 1998 and newer.
Cooling system failure is a leading cause of vehicle breakdowns. Check coolant level frequently and change it according to your ownerâs manual to prevent serious damage or engine failure. Carbon monoxide from your car's exhaust is odorless, colorless-and lethal. If you have any suspicions of a leak, have it checked out at once. Safety comes first! Your car's engine can use more than 10,000 gallons of air for every gallon of fuel burned, so it's easy to see how big a job the air filter has.