Problem 6. The time needed for checking in at a hotel is to be investigated. Historically, the process has had a standard deviation equal to .146. The means of 39 samples of n = 14 are Sample Mean Sample Mean Sample Mean Sample Mean 3.88 21 31 1 2. 11 12 3.86 22 32 13 33 3 4 3.86 3.90 3.83 3.81 3.84 3.83 3.87 14 23 24 25 34 15 3.88 3.81 3.83 3.86 3.82 5 6 35 3.84 3.82 3.89 3.86 3.88 3.90 3.81 3.86 3.98 3.96 3.88 3.76 3.83 3.77 3.86 3.80 3.84 3.79 3.85 16 26 36 7 17 27 37 8 28 38 3.88 3.84 3.80 18 19 9 3.86 3.84 3.87 39 29 30 10 20 a. Construct an x-chart for this process with three-sigma limits. Is the process in control? Draw the mean chart using excel (preferred) or by hand while determining if the process is in control. Problem 6. The time needed for checking in at a hotel is to be investigated. Historically, the process has had a standard deviation equal to .146. The means of 39 samples of n = 14 are Sample Mean Sample Mean Sample Mean Sample Mean 3.88 21 31 1 2. 11 12 3.86 22 32 13 33 3 4 3.86 3.90 3.83 3.81 3.84 3.83 3.87 14 23 24 25 34 15 3.88 3.81 3.83 3.86 3.82 5 6 35 3.84 3.82 3.89 3.86 3.88 3.90 3.81 3.86 3.98 3.96 3.88 3.76 3.83 3.77 3.86 3.80 3.84 3.79 3.85 16 26 36 7 17 27 37 8 28 38 3.88 3.84 3.80 18 19 9 3.86 3.84 3.87 39 29 30 10 20 a. Construct an x-chart for this process with three-sigma limits. Is the process in control? Draw the mean chart using excel (preferred) or by hand while determining if the process is in control