Calculate the 99% confidence interval for the mean of the electrode coverage thickness distribution. Assume Normality. b. If previous years the average thickness of the electrode cover was 24 µm. Can it be said, based on the evidence from the sample, that it has already changed significantly? Explain your reasoning.
Electrical discharge machining (WEDM) is a process used to manufacture conductive components from hard metals. It uses a continuously moving wire that serves as an electrode. The wire electrode coating allows the core of the wire electrode to cool and provides improved cutting performance. The article “High-Performance Wire Electrodes for Wire Electrical-Discharge Machining: A Review” (J. of Engr. Manuf., 2012: 1757-1773) mentions the following observations on the total thickness of the electrode coverage (in µm) of eight electrodes used for WEDM:(need the process can be by hand ,Excel or R.)
21 16 29 35 42 24 24 25
a. Calculate the 99% confidence interval for the mean of the electrode coverage thickness distribution. Assume Normality.
b. If previous years the average thickness of the electrode cover was 24 µm. Can it be said, based on the evidence from the sample, that it has already changed significantly? Explain your reasoning.
[Answers a) 16.8403 ≤ µ ≤ 37.1597 b) No why ...]
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