PRETEST Directions: Choose and write the letter of the best answer on a separate sheet of paper. 1. Which of the following statements is correct? a. An interval estimate is the estimate of Central Limit Theorem. b. An interval estimate is the estimate of the range of possible values for a population parameter. AS RIC c. An interval estimate describes a range of values that is not likely to include the actual population parameter. OF ED d. An interval estimate describes the range of a sample statistic. 2. Which of the following describes confidence intervals? b. 0.90 EXCE a. 51 c. 18 - 24 d. 95% 3. What is the length of the confidence interval if p=0.25, n= 400, and confidence level is 95%? a. 0.85 b. 0.085 C. 0.580 d. 508 ION. ICE! 4. What is the sample size required to estimate a population proportion if the confidence level is 95%, P = 25%, and the margin of error is 3.7%? a. 701.5 b. 700.5 c. 710.5 d. 715.0 5. Find the length of the confidence interval given the following data: o = 0.4, n = 49, confidence level: 95%. a. 0.224 b. 0.422 c. 0.242 d. 0.244