Answer Happy

Walmart has received numerous customer complaints regarding the timeliness of their online orders. You are working In operations management for Walmart and are tasked with checking if these complaints are warranted. First, you decide to examine all the orders for those who purchased guaranteed two-day (48 hour) shipping. Since customers would not complain about early deliveries, you decided to test whether packages are arriving past or later than the 48-hour window. You pull company data on the 177 most recent deliveries and find an average delivery time of 48.62 hours and standard deviation of 3.85 hours. Which of the following would be the appropriate test statistic and finding using a 5% significance level? No testing is needed! Since the sample average (48.62) is greater than the hypothesized value (48), we can say that on average all deliveries are taking longer than 48 hours. Test Statistic = -2.14. We will fail to reject the null hypothesis, and thus we do
No testing is needed! Since the sample average (48.62) is greater than the hypothesized value (48), we can say that on average all deliveries are taking longer than 48 hours. Test Statistic = -2.14. We will fail to reject the null hypothesis, and thus we do not have enough evidence to prove that deliveries are taking longer than an average of 48 hours. Test Statistic = 2.14. We will reject the null hypothesis, and thus we do have enough evidence to prove that deliveries are taking longer than an average of 48 hours. Test Statistic = 2.14. We will fail to reject the null hypothesis, and thus we do not have enough evidence to prove that deliveries are taking longer than an average of 48 hours. Test Statistic = 28.50. We will reject the null hypothesis, and thus we do have enough evidence to prove that deliveries are taking longer than an average of 48 hours.