New One-Sided EWMA t Charts without and with Variable Sampling Intervals for Monitoring the Process Mean

Figure 1

Different lower-sided t charts applied to the dataset in Table 8. (a) The lower-sided EWMA t chart, (b) the lower-sided NEWMA t chart, (c) the lower-sided run rules t chart, and (d) the lower-sided NEWMA t chart with VSI.

(a)

(b)

(c)

(d)