The purpose of an x$-$bar chart is to determine whether there has been a

Question $33$ options:

a$)$

change in the AOQ.

b$)$

change in the dispersion of the process output.

c$)$

change in the central tendency of the process output.

d$)$

change in the number of defects in a sample.

e$)$

change in the percent defective in a sample.