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A new process will be testing for electroplating nickel. The current process is tested on thirty...

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Statistics

  1. A new process will be testing for electroplating nickel. Thecurrent process is tested on thirty slugs, and the mean thicknessof the nickel is 0.0020 m with a sample standard deviation of0.0005 m. The new process is also tested on thirty slugs remaininga sample mean of 0.0022 m and a sample standard deviation of 0.0003m. Assume equal variances.

    (a) Does the new process result in a greater thickness ofnickel? Use α = 0.05. (b) Determine the 99% confidence interval forthe difference in the means.

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