A Manufacturing Company Produces Part 2205 for the Aerospace Industry

question 9

Multiple Choice

A manufacturing company produces part 2205 for the aerospace industry.This particular part can be manufactured using 3 different production processes.The management wants to know if the quality of the units of part 2205 is the same for all three processes.The production supervisor obtained the following data: The Process 1 had 29 defective units in 240 items;Process 2 produced 12 defective units in 180 items and Process 3 manufactured 9 defective units in 150 items.At a significance level of .05,we performed a chi-square test to determine whether the quality of the items produced appear to be the same for all three processes.What is the null hypothesis?

• A)H₀: The number of defectives produced is independent of the production process used.
• B)H₀: The row and column variables are associated with each other.
• C)H₀: The proportion of defective units produced by the three production processes is the same.
• D)Both A and C are correct or at least acceptable way of stating the null hypothesis.
• E)A,B and C are all acceptable ways of stating the null hypothesis.

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Definitions:

Operating Point

The steady-state condition where a system or component operates, often determined by balancing external inputs with the system's response.

Process Variable

A process variable is any measurable condition in a process or system, such as temperature, pressure, or flow rate, which can be controlled and monitored.

Continuous Process

A manufacturing or chemical process that operates uninterrupted, as opposed to batch processing which occurs in distinct steps.