(Steps Shown) A vendor of grinding wheels suspects the manufacture’s claimed life of u=1000 operating hours is too high. To check it he tests 50 wheels
Question: A vendor of grinding wheels suspects the manufacture’s claimed life of u=1000 operating hours is too high. To check it he tests 50 wheels and gets an average mean value of 985 hours and a standard deviation of S=53 hours. What can he conclude at the 0.01 level of significance if he test the null hypothesis u=1000 hours against an appropriate alternative?
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