. R-chart and x-bar chart (20 points). Thermostats are subjected to rigorous testing before they are shipped to air conditioning technicians around the world. The temperature of five thermostats (units) within a production lot are randomly sampled and tested each hour. The table below displays the temperatures (in degrees Fahrenheit) of five thermostat units chosen each hour for five consecutive hours. Sample 1 was selected in the first hour, Sample 2 was selected in the second hour, and so on, and so forth. (Please note that a column of data is one sample. The exercise in class had a sample going across a row!) a. Compute the upper and lower control limits for the sample means and ranges of the thermostat testing process. b. Draw an R-chart and x-bar chart for this process. Examine both charts. Is this process in control? Explain