Answer to Question #349421 in Statistics and Probability for gab

Question

9.37 A study was conducted to determine if a certain treatment has any effect on the amount of metal removed in a pickling

operation. A random sample of 100 pieces was immersed in a bath for 24 hours without the treatment, yielding an average of 12.2

millimeters of metal removed and a sample standard deviation of 1.1 millimeters. A second sample of 200 pieces was exposed to the

treatment, followed by the 24-hour immersion in the bath, resulting in an average removal of 9.1 millimeters of metal with a sample

standard deviation of 0.9 millimeter. Compute a 98% confidence interval estimate for the difference between the population means.

Does the treatment appear to reduce the mean amount of metal removed?

Answer 1

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