i need help with 26-30. 25 is correct and the others im not sure

XCO 6 7 8 9 10 11 12 13 14 15 More Bin Table 2 - Statistics of Length of Stay by Month Year Month Mean Length of Stay Standard Deviation Range # of Patients Staying over 10 Days 2019 Nov 10.33 166 9.78 3.03 2020 8.89 1.62 2020 11.11 2020 10.22 2020 11.56 Question 10 a 9 Suppose that the researcher knows the mean length of stay of the AMI patient population to be 10 days and the standard deviation to be 2 days, and uses the monthly sample data (November 2019 to April 2020) to build an 3-sigma X-bar chart. What is the centerline of the chart? 10.00 Cannot be decided, but between 8.89 and 11.56 10.31 Cannot be decided, but between 9.78 and 11.11 Question 26 6 pts Following the previous question, what is the lower control limit? 8.90 8.00 9.00 8.69 D Question 27 O pts Following the previous question, what is the conclusion about the care process quality Out of control Cannot be decided from the data given Partly in control and partly out of control In control Question 28 6 pts If the researcher draws the conclusion in the previous question, what is the type I error? 0.003 0.005 0.030 0.050 . Question 29 Suppose that the researcher does not know the mean or standard deviation of the length of stay of the AMI patient population and uses the monthly sample data (November 2019 to April 2020) to control the care process quality. What is the upper controllimit of the 3-sigma X-bar chart? 12.19 12.51 22.19 21.80 D Question 30 Following the previous questions, with respect to the range of the length of stay, what is the lower controllimit of a 3-sigma chart? 11.80 1.20 0.88 0.00 XCO 6 7 8 9 10 11 12 13 14 15 More Bin Table 2 - Statistics of Length of Stay by Month Year Month Mean Length of Stay Standard Deviation Range # of Patients Staying over 10 Days 2019 Nov 10.33 166 9.78 3.03 2020 8.89 1.62 2020 11.11 2020 10.22 2020 11.56 Question 10 a 9 Suppose that the researcher knows the mean length of stay of the AMI patient population to be 10 days and the standard deviation to be 2 days, and uses the monthly sample data (November 2019 to April 2020) to build an 3-sigma X-bar chart. What is the centerline of the chart? 10.00 Cannot be decided, but between 8.89 and 11.56 10.31 Cannot be decided, but between 9.78 and 11.11 Question 26 6 pts Following the previous question, what is the lower control limit? 8.90 8.00 9.00 8.69 D Question 27 O pts Following the previous question, what is the conclusion about the care process quality Out of control Cannot be decided from the data given Partly in control and partly out of control In control Question 28 6 pts If the researcher draws the conclusion in the previous question, what is the type I error? 0.003 0.005 0.030 0.050 . Question 29 Suppose that the researcher does not know the mean or standard deviation of the length of stay of the AMI patient population and uses the monthly sample data (November 2019 to April 2020) to control the care process quality. What is the upper controllimit of the 3-sigma X-bar chart? 12.19 12.51 22.19 21.80 D Question 30 Following the previous questions, with respect to the range of the length of stay, what is the lower controllimit of a 3-sigma chart? 11.80 1.20 0.88 0.00