In constructing a confidence interval for the population mean using the t-distribution, we often need the degrees of freedom (df), confidence level, and the critical value. Use the Student t-distribution to determine the missing values in the table below. Report the positive t critical value accurate to 3 decimal places. Sample Degrees of Confidence Critical size freedom level value (t) 17 % 1.746 21 98% 15 % 2.145 10 99% Question Help: DVideo B Read Check