QUESTION 29 3 points Save Answer Find the confidence level related to the critical value za/2= -1.54. C 91.8% C 87.6% C 99.5% C 94.6% QUESTION 30 3 points Save Answer Aisha wants to estimate the average study time per week for students in MAT213 course. To accomplish that she randomly selects 50 such students and records their weekly study times in hours. Assume that the weekly study times are normally distributed. Which distribution should be used to construct the confidence interval? Neither standard normal distribution nor t-distribution. C Standard normal distribution. Ct-distribution with 49 degrees of freedom. C t-distribution with 50 degrees of freedom