A company wants to determine if the average weight of their new product packaging machines is significantly different from the industry average. They collected a random sample of 25 machines and measured their weights. The population standard deviation is unknown. The sample mean weight is 1200 kg, and the sample standard deviation is 200 kg. The industry average weight of packaging machines is 1100 kg. The significance level is set at 0.05.
Based on the problem statement, identify whether the Z or T distribution should be used for hypothesis testing and calculate the test statistic.