A company is investigating two potential vendors on the timeliness of their deliveries. A random sample of
Question:
(a) Find a 90% confidence interval for the ratio of the variances of the delay times for the two vendors.
(b) What assumptions are needed to solve part (a)?
(c) Can we conclude that the first vendor has a smaller variability regarding delay times than the second? Use a significance level of 0.05.
(d) Which vendor would you select, and why?
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n 10 1 45 s 1 23 n 2 12 2 34 s 2 62 a 90 CI for 1 2 2 2 b Each population is normally distributed Ra...View the full answer
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Related Book For 
Fundamentals of quality control and improvement
ISBN: 978-0470226537
3rd edition
Authors: amitava mitra
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