A new purification unit is installed in a chemical process. Before and after installation data was collected
Question:
Before (1): Sample mean = 9.85, Sample variance = 6.79, Number of samples = 10
After (2): Sample mean = 8.08, Sample variance = 6.18, Number of samples = 8
a. Can you conclude that the two variances are equal using a two-sided 95% confidence interval?
b. Can you conclude that the new purification device has reduced the mean percentage of impurity using a two-sided 95% confidence interval?
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a Since one is included in the interval we can conclude that ...View the full answer
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Related Book For 
Managing Controlling and Improving Quality
ISBN: 978-0471697916
1st edition
Authors: Douglas C. Montgomery, Cheryl L. Jennings, Michele E. Pfund
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