Statistics: Testing Hypothesis with the Z-statistic – #55

Question: You are considering a new delivery system and wish to test whether delivery times are significantly different, on average, than your current system. It is well established that the mean delivery time of the current system is 2.38 days. A test of the new system shows that, with 48 observations, the average delivery time is 2.23 days with a standard deviation of 0.43 day. Test at a significance level of .05. Summarize your results in a brief memo to management.


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