3.2

Assume that a sample is used to estimate a population mean u. Find the 90% confidence interval for a sample of size 596 with a mean of 31.3 and a standard deviation of 18.3. Enter your answer as a tri-linear inequality accurate to one decimal place (because the sample statistics are reported accurate to one decimal place). Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places