Construct a 98% confidence interval to estimate the population mean when x = 138 and s = 34 for the sample sizes below. a) n = 40 b) n = 50 c) n = 80 Click here to view page 1 of the critical t-score table. Click here to view page 2 of the critical t-score table. a) The 98% confidence interval for the population mean when n = 40 is from a lower limit of ] to an upper limit of ] (Round to two decimal places as needed.) b) The 98% confidence interval for the population mean when n = 50 is from a lower limit of ] to an upper limit of (Round to two decimal places as needed.) c) The 98% confidence interval for the population mean when n = 80 is from a lower limit of to an upper limit of ] (Round to two decimal places as needed.)