A Tool Manufacturer Tests Three Types of Cutters Used in a Lathe

question 11

Multiple Choice

A tool manufacturer tests three types of cutters used in a lathe operation. One type is a laminated steel cutter made of very hard high-carbon steel sandwiched between two softer steels. Another is a special high-speed steel cutter developed using powder metallurgy. The final one is made from cryogenically treated steel. Cutters of each type are tested to see how long they will last (in hours) in continuous operation until they need to be sharpened. The times are recorded for each cutter used in the study, and the results are given below. Under the null hypothesis that the three populations have the same continuous distribution:

• A)H has approximately a chi-square distribution, with 3 degrees of freedom.
• B)H has approximately an F(2, 6)distribution.
• C)H has approximately a chi-square distribution, with 2 degrees of freedom.
• D)H has a distribution that cannot be evaluated because the populations may not be Normal.

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Definitions:

Lean Environment

An approach to operations that emphasizes the minimization of waste within manufacturing systems while simultaneously maximizing productivity.

Raw Materials

Basic materials used in the production process, not yet processed or manufactured into final products.

Traditional Environment

An operational setting adhering to long-established methods and practices, often resisting modernization.

Setups

Preparatory actions or costs associated with configuring equipment or workspaces for a production run or task.