lpen Assignment FULL SCREEN PRINTER VERSION 4 BACK Question 2 BIncorrect. Try again. Remember to first find the interval for the ratio of variances and then take the square roots of the endpoints to obtain the interval for the ratio of standard deviations. The diameter of steel rods manufactured on two different extrusion machines is being investigated. Two random samples of sizes n1=13 and n2=16 are selected, and the sample means and sample variances are 51 =873, 612 =O.35, 52 =8.68, and 83 =0.40, respectively. Assume that the data are drawn from a normal distribution. Construct the following (Use only Table VI of Appendix A): (a) A 90% two-sided CI on 01102 . Round your answers to 3 decimal places. cx:(,> (b) A 95% two-sided CI on 01102. Round your answers to 3 decimal places. c1:(,)Which of the following is a true statement regarding the widths of the 90% and 95% C15? 1. The width of the 95% CI is larger because we have more confidence in the 95% interval. 2. The width of the 95% CI is larger because there is a greater probability that it contains the true ratio of standard deviations. 3. The 90% CI is better since it has smaller width than the 95% CI. 4. The 95% CI is wider because it is 5% more likely to contain the true ratio of standard deviations. True statement: X in (c) A 90% lower-confidence bound on ol 1 Oz. Round your answer to 3 decimal places. X lower-confidence bound = Questlon Attempts: 1 of 3 used SAVE FOR LATER . , s l. Copyright @ 2000-2016 by John Wiley & Sons, Inc. or related companies. All rights reserved