CQE考题求助？？感谢！
The factory installed brake linings for a certain kind of car have a mean lifetime of 60,000 miles with a 6,000 mile standard deviation. A sample of 100 cars has been selected for testing. What is the standard error of ? (Assume that the finite population correction may be ignored.) The factory installed brake linings for a certain kind of car have a mean lifetime of 60,000 miles with a 6,000 mile standard deviation. A sample of 100 cars has been selected for testing. What is the standard error of ? (Assume that the finite population correction may be ignored.)
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杨格_Alan (威望:668) (江苏 无锡) 机械制造
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where
σ is the standard deviation of the population.
n is the size (number of observations) of the sample.