Direction: Given the problem below, test the hypothesis using One-Sample Z-test. HANDWRITTEN. COPY AND ANSWER WITH COMPLETE SOLUTION. 1. Powdered milk is packed in a I-kilogram bag. An inspector from the Department Trade and Industry (DTI) suspects the bags may not contain I kilogram. A sample of 40 bags produces a mean of 0.96 kilograms and a standard deviation of 0.12 kilogram, Is there enough evidence to conclude that the bags do not contain 1 kilogram as stated at a = 0.05