Suppose we wish to construct a control chart for a marche tile population line. We have 20 samples each of size 100. The number of defectile tiles in each sample is provided in the table below (assume z=3)

11) What is the value corresponding to the centre line (CL) of the p-chart for the above data?

12) What is the lower control limit of the p-chart corresponding to the above data?

13) What is the upper control limit of the p-chart corresponding to the above data?

14) The p-chart for the data is depicted below. Is the process in control or not in control?

a) Process is in control.

b) Process is not in control.

15) Pick the true statements.

a) If a process is in control, it can exhibit assignable variations.

b) If a process is in control, it can exhibit natural or random variations.

c) If a process is not in control, it can exhibit assignable variations.

d) If a process is not in control, it can exhibit natural or random variatiions.

Sample No. of Sample No. of Defectives Defectives 44 11 36 48 12 52 32 13 35 50 14 41 29 15 42 31 16 30 46 17 46 52 18 38 44 19 26 48 20 30