Critical value for the calculation

What is the new critical value you will use for this calculation? Q30: As you know, two values will be required to complete the following equation:  __________   __________ Q31: Which of the following is a more accurate interpretation of the confidence interval you just computed? A. We are 95% confident that the scores fall in the interval _____ to _____. B. We are 95% confident that the average score on the SAT by the students who took the prep course falls in the interval _____ to _____. C. We are 95% confident that the example above has correct values. D. We are 95% confident that the difference in SAT scores between the students who took the prep course and the students who did not falls in the interval _____ to _____.