What is the minimum sample size we must use if we want a probability equal to 0.95 to detect a mean change magnitude +2 a (on the first subsequent sample), through X-bar Shewhart control chart? 0.95x=2 n=5 n=6 045 no ur 63% of 8 n=8 13 % of 8 n=9 n = 10 25% of 8
