Question: 12. The time needed for checking in at a hotel is to be investigated. Historically, the process has had a standard deviation equal to .

12. The time needed for checking in at a hotel is

12. 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 1 31 3.88 3.86 2. 3 4 3.88 3.81 32 33 34 35 5 3.86 3.90 3.83 3.81 3.84 3.83 3.87 3.88 3.84 3.80 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 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 6 3.83 3.86 3.82 3.86 3.84 3.87 36 7 37 8 9 10 38 39 a. Construct an -chart for this process with three-sigma limits. Is the process in control? b. Analyze the data using a median run test and an up/down run test. What can you conclude

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