The article Exhaust Emissions from Four-StrokeLawn Mower Engines (J. of the Air and Water Mgmnt.Assoc., 1997: 945952) reported data from a study inwhich both a baseline gasoline mixture and a reformulatedgasoline were used. Consider the following observationson age (yr) and NOx emissions (g/kWh):Engine 1 2 3 4 5Age 0 0 2 11 7Baseline 1.72 4.38 4.06 1.26 5.31Reformulated 1.88 5.93 5.54 2.67 6.53Engine 6 7 8 9 10Age 16 9 0 12 4Baseline .57 3.37 3.44 .74 1.24Reformulated .74 4.94 4.89 .69 1.42Construct scatterplots of NOx emissions versus age. Whatappears to be the nature of the relationship between thesetwo variables? [Note: The authors of the cited articlecommented on the relationship.]
Statistics: Intro information Data: What is it o information we collect and organize o facts and figures o numbers and text What is the point of Statistics o To process data so that it is useful o Provide meaningful information in an easily accessible way o Answer questions o Tell a story Help business leaders o Improved insight about operations o Make decisions that are: (prove your opinion is right) Data-driven Fact-based o Not based on speculation o EX: UPS, to increase productivity Benefits of Data and Statistics o Reduce cost o Increase profit
