Where you live, you can pick up an order from Costco in about 15 minutes by walking. We would like to test whether the average time for a robot delivery differs from this 15 minutes. Assuming the time X for a robot delivery is distributed as X-N (μ, o²), and we take a random sample of n=8, we wish to test Ho : μ = 15 US Η : μ # 15 at the 5% significance level. We observe n=8, = 23.1 and s-14.328 where s is the sample standard deviation. The value of the test statistic and the decision are 1.599, do not reject the null hypothesis 2.36, reject the null hypothesis 0.565, do not reject the null hypothesis 5.523, reject the null hypothesis

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