Tire following data (in. ohms) are the resistance of resistors made on an automated machine. The mean and range of each sample are given in the right two columns, and the mean of sample means and the mean of sample ranges are given below these.
a. Develop sample mean and sample range control charts for resistance of resistors using the first 10 samples. Is the process in control?
b. Use the control charts developed in part a to decide if the eleventh sample (also given below) indicates an out-of-control situation.

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Resistance of Resis tors (in ohms) Sample Obs 2 Obs 3 bs 4 Mea Range 25 15 25 1,010 995 990 1,015 1,013 994 989 1,001 1,006 992 991 996 1,003 1,020 1,019 1,001 992 986 989 1,007 985 1,009 1,015 1,009 1,005 994 982 996 1,005 1,006 986 994 1,008 998 993 1,005 1,020 996 1,007 979 993.00 998.50 1,004.00 1,010.50 1,007.50 998.50 995.75 994.75 1,001.75 996.00 1,000.03 18 28 22.30 996 1,006 C97 989