The Xbar and EWMA charts are farily robust to nonnormality o

The X-bar and EWMA charts are farily robust to non-normality of the measured data. What characteristic of the plotted values makes this possible? In forming rational subgroups for control charts, we are interested m assessing coin within group and \'between group\' variability. In the following statements, circle the word in parentheses that correctly completes the statement. Maximize the difference (within/between) subgroups. Minimize the difference (within/between) subgroups. In the following statements, circle the word in parentheses that correctly completes the statement regarding the use of X-bar and R control charts to monitor a quality characteristic of interest. The R chart monitors the (within/between) sample variability. The X bar chart monitors the (within/between) sample variability. When using the X-bar and R charts to monitor a process, we can usually ignore the R chart and proceed directly to analyzing the X-bar chart. Circle your answer. True/False The Western Electric warning rules used on control charts are based on which continuous distribution? What subgroup sample size is usually used to find values for D_3. D_4 and d_2 when using the Individuals and Moving Range charts? The formula for the subgroup range R_1 = An inspection unit possessing one or more nonconformities (e.g., appearance flaws) is never classified as nonconforming.

Solution

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2)

maximize the difference within groups

minize the difference between groups

4

TRUE

8

FALSE