For a 2-tail test at the 5% significance level...

[answerhappygod]

Determine whether the population mean waiting time to place an order at your restaurant has changed in the past month from its previous population mean of 5.5 minutes. Assume the population is normally distributed, but that the standard deviation is unknown. You select a sample of 30 orders during a one-hour period. Sample mean = 5.0 minutes and sample standard deviation = 1.6 minutes.

For a 2-tail test at the 5% significance level, the absolute value of the critical value is _______ and the absolute value of the test statistic is _______.


2.045, 1.72