#8

Math-K300 Spring 2022 Online Kierstyn Cochran 03/27/22 4:02 PM Homework: Section 6.4 Confidence Intervals for Question 8, 6.4.13-T HW Score: 69.32%, 15.25 of 22 points E Save Variance and Part 3 of 4 Points: 0.25 of 1 The diameters (in inches) of 17 randomly selected bolts produced by a machine are listed. Use a 90% level of confidence to construct a confidence interval for (a) the population variance of and (b) the population standard deviation o. Interpret the results. 4.478 4.429 4.021 4.319 4.002 3.766 3.815 3.768 4.236 3.973 4.154 4.573 3.976 3.741 3.887 3.835 4.426 (a) The confidence interval for the population variance is ( 0.047 . 0.156 ). (Round to three decimal places as needed.) Interpret the results. Select the correct choice below and fill in the answer box(es) to complete your choice. (Round to three decimal places as needed.) O A. With 90% confidence, it can be said that the population variance is less than O B. With 10% confidence, it can be said that the population variance is greater than C. With 90% confidence, it can be said that the population variance is between 0.047 and 0.156 O D. With 10% confidence, it can be said that the population variance is between and (b) The confidence interval for the population standard deviation is (]. K (Round to three decimal places as needed.)