Statistics for Engineers and Scientists
4th Edition
ISBN: 9780073401331
Author: William Navidi Prof.
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 9.4, Problem 9E
You have been given the task of designing a study concerning the lifetimes of live different types of electric motor. The initial question to be addressed is whether there are differences in mean lifetime among the five types. There are 20 motors, four of each type, available for testing. A maximum of five motors can be tested each day. The ambient temperature differs from day to day, and this can affect motor lifetime.
- a. Describe how you would choose the five motors to lest each day. Would you use a completely randomized design? Would you use any randomization at all?
- b. If Xij represents the measured lifetime of a motor of type i tested on day j, express the test statistic for testing the null hypothesis of equal lifetimes in terms of the Xij.
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Chapter 9 Solutions
Statistics for Engineers and Scientists
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