A Hotel Chain Periodically Analyzes Its Service Times to Check

question 5

Multiple Choice

A hotel chain periodically analyzes its service times to check for variation in service processes.To do this,it uses R-charts.Seven samples,each containing observed checkout time with three different customers,were collected.The average mean and the average range of the service times are found to be 9.924 and 0.957,respectively.If D₄ for the R-chart is 1.924,the upper control limit (UCL_R) for the R-chart will be:

• A) less than or equal to 1.0.
• B) greater than 1.0 but less than or equal to 1.5.
• C) greater than 1.5 but less than or equal to 2.0.
• D) greater than 2.0 but less than or equal to 2.5.

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