x90 = 18 n=23 Construct a 99% confidence interval to estimate the population mean using the following data. What assumptions need to be made to construct this interval? What assumptions need to be made to construct this interval? O A. The population is skewed to one side. B. The population mean will be in the confidence interval OC. The sample size is less than 30 OD. The population must be normally distributed With 90% confidence, when n-23 the population mean is between the lower limit of and the upper limit of (Round to two decimal places as needed.)