Suppose you have sample data where = 20 and n = 25. You want to create a 99% confidence interval for the mean. Also, the sample standard deviation is 4. a) What is the point estimate for the mean? 20 b) What is the critical value for the confidence interval? Round to 4 decimal places. 2.7969 c) What is the margin of error for the confidence interval? Round to 3 decimal places. d) What is the confidence interval? Round to 3 decimal places. I