Samples of DNA are collected, and the four DNA bases of A, G, C, and T are coded as 1, 2, 3, and 4, respectively. The results are listed below. Construct a 90% confidence interval estimate of the mean. What is the practical use of the confidence interval? 1,1,2,4,3,3,3,3,4,2 What is the confidence interval for the population mean ? ? <?< (Round to one decimal place as needed)