helpOUESTION $2$:

A graph representing a statistical process control chart for the production of gnomes.

a$)$ What are the functions of lines $x,y$ and $-$y shown in the control chart and how are

they set?

b$)$ What recommendation would you make if you saw the results shown in the chart?

c$)$ How are control limits likely to be affected by the size of the sample taken and the

variability of the production process?

d$)$ Explain whether or not ideas of SPC have had an effect on statistical quality analysis

control techniques?

e$)$ Statistical process control $($SPC$)$ is quantitative problem solving, consisting of

diagnostic techniques to assist in locating problem sources and prescriptive techniques

to help solve problems. How might SPC improve customer satisfaction and does SPC

eliminate the need for market research? $($