[1} We give another example using all the methods we have studied so far. A grocer wishes to check if the median number of items purchased in his store is 1|]. So 15 customers are selected at the checkout counter and the number of items recorded is 22, 9,4,5,1, 15,15,133, 47,3,31,T,1i},,3. Nsrnely, we consider H.\" : 1?: =13 vs H1 : m 75 10. Use the following tests: (d) Normal approximation to the Wilcoxon sign rank test. (c) t-test. (Assuming the data is from a normal distribution.)