Potato chips are packed into packet using an automated process Target weight of a packet is 150 grams. Standard deviation of weight is 0.5 gm In order to improve the packaging process, the company has taken up a project. 6 packets were weighed before start of the project. These are 151.5, 1 152.4, 0.4,151.8, , 151.6. After the project was completed12 packets were weighed. The data are given below 151.0 150.8 149.2 150.2 151.1 151.5

150.7 149.3 150.5 150. 6 150.8 151.4 Test at 5% level of significance if there is any change in packet weight.