For a variable control a circuit voltage will be examined on a sample of only 5-circuits. The last average voltage for sample size five has been 3.1 volt, and the range has ben 1.2 volts.
What are the upper and lower control limits for the resulting control charts (average and range).
Five sample of voltage are taken with results:
sample 5
x= 3.6, 3.3, 2.6, 3.9, 3.4
R= 2.0, 2.6, 0.7, 2.1, 2.3
what action should be taken?