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
a. Construct an x̅-chart for this process with three-sigma limits. (Do not round intermediate calculations. Round your answers to 2 decimal places.)
b. Analyze the data using a median run test and an up/down run the test. What can you conclude?