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The time needed for checking in at a motel is to be investigated. Historically, the process has had a standard deviatior anial in 173. The means of 39 samples of n=25 are Click here for the Excel Data File a-1. Construct an x-chart for this process with three-sigma limits. (Do not round intermediate calculations. Round your a-1. Construct an x-chart for this process with three-sigma limits. (Do not round intermediate calculations. Round you answers to 2 decimal places.) 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