1. An analysis of the extensive records of an exporter shows that 10 orders for a raw material from a certain supplier were received in 7, 9, 16, 13, 12, 15, 10, 8, 9, and 6 days. Use the 0.01 level of significance to test the claim that on the average such orders are filled by the supplier in 7.5 days. Choose the alternative hypothesis in such a way that rejection of the null hypothesis, =7.5 days, implies that it takes longer than that.