a certain railway company claims that its trains run late 5 minutes on the average. the actual
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a certain railway company claims that its trains run late 5 minutes on the average. the actual times (minutes) that 10 randomly selected trains ran late were provided giving a sample mean=9.130 and a sample standard deviation= 1.4. In testing the company's claim, at the significance level of 0.01 and assuming normality, the value of the test statistic and the critical values are respectively
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