Sample data set 72.1 71.2 67.9 67.3 69.5 68.6 68.8 69.4 73.5 67.1 69.2 75.7 71.1 69.6 70.7 66.9 71.4 62.9 69.2 64.9 68.2 65.2 69.2 72.2 67.5 66.6 66.5 64.2 65.4 70.0 63.8 71.4 65.1 If o = 2.89, the 90% confidence interval for the population mean is Round values to two decimal places