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The time needed for checking in at a hotel is to be investigated. Historically, the process...

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 = 20 are


Sample Mean Sample Mean Sample Mean Sample Mean
1        3.86 11 3.88 21 3.84 31 3.88
2        3.90 12 3.86 22 3.82 32 3.76
3        3.83 13 3.88 23 3.89 33 3.83
4        3.81 14 3.81 24 3.86 34 3.77
5        3.84 15 3.83 25 3.88 35 3.86
6        3.83 16 3.86 26 3.90 36 3.80
7        3.87 17 3.82 27 3.81 37 3.84
8        3.88 18 3.86 28 3.86 38 3.79
9        3.84 19 3.84 29 3.98 39 3.85
10        3.80 20 3.87 30 3.96


a-1.

Construct an formula126.mml -chart for this process with three-sigma limits. (Do not round intermediate calculations. Round your answers to 2 decimal places.)


  UCL   
  LCL   


a-2. Is the process in control?
Yes
No


b.

Analyze the data using a median run test and an up/down run test. What can you conclude?


Test         Conclusion
  Median    (Click to select)RandomNon-random
  Up/Down    (Click to select)RandomNon-random
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