Assertion (A): While plotting control charts for variables, averages of sub - groups of readings are used rather than the individual readings,
Reason (R): If control charts, are plotted with the individual readings, the labour of plotting the chart will increase.
Option (A)
Both A and Rare true and R is the correct explanation of A
Option (B)
Both A and R are true but R is NOT the correct explanation of A
A is true but R is false
A is false but R is true
Correct Option: