Need help with b.

The time needed for checking in at a motel is to be investigated. Historically, the process has had a standard deviation equal to 0.155 The means of 39 samples of n = 15 are Sample Somple Sample Mean Sample 3.86 12 Mean 1 3.84 3.82 3 4 3.90 3.83 3.81 3.84 3.83 3.87 3.88 3.84 3.80 12 13 14 15 16 17 18 19 20 Mean 3.88 3.86 3.88 3.81 3.83 3.86 21 22 23 24 25 26 27 31 32 33 34 35 36 3.56 3.88 3.90 3.51 Mean 3.88 3.76 3.83 3.77 3.86 3.80 3.34 3.70 3.85 3.86 3.84 3.87 38 39 29 30 3.95 3.96 Click here for the Excel Dato File a-1 Construct an-chart for this process with three-sigma limits. (Do not round intermediate calculations. Round your answers to 2 decimal places.) UOL LOL 3.73 b. Analyze the data using a median run test and an up/down run test. What can you conclude? Conclusion Test Median Up/Down