q1_2005 - MIT OpenCourseWare http:/ocw.mit.edu Spring 2008...

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MIT OpenCourseWare http://ocw.mit.edu 2.830J / 6.780J / ESD.63J Control of Manufacturing Processes (SMA 6303) Spring 2008 For information about citing these materials or our Terms of Use, visit: http://ocw.mit.edu/terms .
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Massachusetts Institute of Technology Department of Mechanical Engineering 2.830-6.780J / SMA 6303 Control of Manufacturing Processes Quiz 1 March 10 2005 Open Book and Notes Problem #1 (35%) A tire company has developed a new tread design that is expected to have a mean life of 60,000 miles. To test this, a single sample of 9 tires is taken. We can assume that tire life is normally distributed, and from the 9 samples determine a standard deviation of s = 1200 miles and a sample mean of 60,578 a) Based on the one sample mean, how confident are you that the mean of the process is 60,000? b) If instead, the hypothesized true mean was 59,000, how would your level of confidence change, given the same single sample mean? c) Suppose the true mean value was indeed 59,000 but we assumed it was 60,000. We
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This note was uploaded on 09/24/2010 for the course MECHE 2.830J taught by Professor Davidhardt during the Spring '08 term at MIT.

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q1_2005 - MIT OpenCourseWare http:/ocw.mit.edu Spring 2008...

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