THE NEXT QUESTIONS ARE BASED ON THE FOLLOWING INFORMATION

question 79

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.
-State the null and alternative hypotheses.

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Definitions:

Regression

A geological process by which areas of submerged seafloor are exposed above sea level, often due to sea-level fall or land uplift.

Shale

A fine-grained sedimentary rock formed from clay and mud, characterized by its ability to split into thin layers along natural fractures.

Sandstone

A sedimentary rock consisting of sand particles bonded together by natural cements such as silica or calcium carbonate.

Erosionally Resistant Cliffs

Cliffs that demonstrate a high resistance to weathering and erosion, often due to their geological composition, maintaining steep faces over time.