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Wire electrical discharge machining WEDM is a process used to manufacture conductive hard metal components...

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Wire electrical discharge machining WEDM is a process used to manufacture conductive hard metal components It uses a continuously moving wire that serves as an electrode Coating on the wire electrode allows for cooling of the wire electrode core and provides an improved cutting performance An article gave the following sample observations on total coating layer thickness in m of eight wire electrodes used for WEDM 22 17 29 35 42 24 25 25 Calculate a 99 CI for the standard deviation of the coating layer thickness distribution Round your answers to two decimal places Is this interval valid whatever the nature of the distribution Explain Yes there are enough data points for this interval to be valid No validity of this interval requires that coating layer thickness be at least approximately normally distributed You may need to use the appropriate table in the Appendix of Tables to answer this question

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