Business Statistics: For Contemporary Decision Making

S. currency to replace each seal, thus makingthe Clarkson longer-lasting valves more attractive. Tyco does business with pipeline companies around the world.Suppose in an attempt to develop marketing materials,Tyco marketers are interested in determining whetherthere is a signi?cant difference in the cost ofreplacingpipeline seals in different countries.Four countries—Canada,Colombia,Taiwan,and the United States—arechosen for the study.Pipeline operators from equivalentoperations are selected from companies in each country.The operators keep a cost log ofseal replacements.A ran-dom sample ofthe data follows.Use these data to helpTyco determine whether there is a difference in the cost ofseal replacements in the various countries.Explain youranswer and tell how Tyco might use the information intheir marketing materials.Suppose that Tyco now uses a similar systemand wants to test to determine whether lead-times differsigni?cantly according to the type ofvalve it is manufac-turing.As a control ofthe experiment,they are includingin the study,as a blocking variable,the day ofthe week thevalve was ordered.One lead-time was selected per valveper day ofthe week.The data are given here in weeks.Analyze the data and discuss your ?ndingsCanada Colombia Taiwan United States$215 $355 $170 $230205 280 190 190245 300 235 225270 330 195 220290 360 205 215260 340 180 245225 300 190 230Type of ValveSafety Butter?y Clack Slide Poppet NeedleMonday 1.6 2.2 1.3 1.8 2.5 0.8Tuesday 1.8 2.0 1.4 1.5 2.4 1.0Wednesday 1.0 1.8 1.0 1.6 2.0 0.8Thursday 1.8 2.2 1.4 1.6 1.8 0.6Friday 2.0 2.4 1.5 1.8 2.2 1.2Black, Ken (2011-12-01). Business Statistics: For Contemporary Decision Making,