The weight of adults in a certain city has a mean of 130 lbs, with a standard deviation of 41 lbs. A sample of 25 adults living in one of the kebeles of the city is found to have a mean weight of 129 lbs. Does this mean the residents of the kebele weight significantly less on the basis of the 1% level of significance and construct 99% confidence interval of sample weight? (Assume the normal population.)