Paired t test

Case Study - to detect the changes of diameter

Method: use paired t test to analyse the size of Diameter(After Turning, Hardened, Tumbling & Passivation)

Step 1: Data collection

Process Flow are :

Turning => measure the diameter =>Hardening=>measure the diameter=>Tumbling=>measure the diamter=>Passivation=>measure the diameter.

All samples are labelled.

Step 2: Data Analysis (Paired t test)