THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION

question 82

Essay

THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION:
As part of its quality control program,the Scullia Auto Company (SAC)began inspecting all supplier shipments of steel bars and recording the defect rate according to quality criteria such as strength,dimensional characteristics,etc.When SAC began this program,the defect rate in 100 shipments averaged 9%.A recent report indicated an average defect rate of 2.2% in 136 shipments.The quality control department wants to determine,at the 0.05 level of significance,if this represents a significant improvement in the quality of the steel.
-At the 0.05 level of significance,what conclusion can be drawn,from the hypothesis test,about the quality improvement in the Scullia Auto Company?

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