The Two Control Limits for 3=sigma $\bar { x }$ Chart Have Been Calculated

Short Answer

The two control limits for 3=sigma $\bar { x }$ chart have been calculated. If the variable of interest is normally distributed, and 3 is replaced by 2.5 in the control limits formulas, then probability of Type I error $( \alpha )$ __________, but for fixed n and $\sigma$ , probability of Type II error $( \beta )$ will __________.