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3.19 Suppose n = 10 observations were collected on the time spent in a manufacturing system for a part. The analysis determined a 95% confidence

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3.19 Suppose n = 10 observations were collected on the time spent in a manufacturing system for a part. The analysis determined a 95% confidence interval for the mean system time of 18.595, 32.421] (b) Find the approximate number of samples needed to have a 99% confidence inter- val that is within 1 minute of the true mean system time

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