Refer to Exercise13.16 and the monitoring of irrigation data by the CIMIS. Recall that daily minimum air temperatures (°C) collected hourly during the month of May at the Davis CIMIS station yielded the following summary statistics (where five measurements are collected each hour): x = 10.16 and R = 14.87.

a. Use the information provided to find the lower and upper control limits for an R-chart.
b. Suppose that one day in May the air temperature at the Davis CIMIS station had a high of 24.7° and a low of 2.2°. How should the manager of the station respond to this observation?

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