Ferrous steel company manufactures steel plates for the construction industry. During fabrication, it faces various defects such as blisters, cracks, and porosity. Since there could be internal cracks, testing plates can be a challenge and hence it adopts nondestructive testing techniques through ultrasonic sounds. The following results are obtained from testing eight randomly selected samples:

Determine the c-chart two-sigma upper and lower control limits for this process. Is the process in statistical control?

Transcribed Image Text:

Steel Plate Number 1 2 3 4 Defects 5 6 9 4 Steel Plate Number 5 6 7 8 Defects 3 0 9 19