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18. (1 point) The sample mean and standard deviation from a random sample of 31 observations from a normal population were computed as x =

18. (1 point) The sample mean and standard deviation from a random sample of 31 observations from a normal population were computed as x = 35 and s = 15. Calculate the t statistic of the test required to determine whether there is enough evidence to infer at the 9% significance level that the population mean is greater than 31. Test Statistic = (

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